Concussion substitutes will be trialled in the Premier League from February 6, English football's top division has confirmed.

A maximum of two substitutes will be allowed in addition to the stipulated allocation of three substitutions in the event of a player suffering a head injury and showing symptoms of concussion.

The Football Association (FA) and the Premier League applied to the International Football Association Board (IFAB) to introduce the trials .

The 12:30 GMT kick-off between Aston Villa and Arsenal on February 6 will be the first game of the trial, which runs until the end of 2020-21, with an option to extend into next season.

The Women's Super League and Women's Championship will also take on concussion subs from the same date, with the men's FA Cup introducing them from the fifth round on February 9-11.

Concussion substitutes in the FA Cup would be in addition to the five clubs are permitted to make in this season's competition.

A Premier League statement read: "The trial is a result of the IFAB's consultation with stakeholders and recommendations from their concussion expert group to allow additional substitutions for players with actual or suspected concussion."

FIFA has also moved to use concussion substitutes at the forthcoming Club World Cup, although teams at next month's tournament will only be able to make one such replacement per match.

Bayern Munich have confirmed Leon Goretzka and Javi Martinez have tested positive for coronavirus.

The players are self-isolating at home after returning positive results this week, although the club described both as being in "good health".

They will be unavailable for Saturday's Bundesliga match at home to Hoffenheim.

The European champions then face Hertha Berlin away on February 5 before their Club World Cup campaign starts three days later.

Goretzka has made 20 appearances in all competitions this season, while Martinez, 32, has played 18 times, mostly as a substitute.

Bayern also confirmed goalkeeper Alexander Nubel is likely to be out of action for up to a month.

The former Schalke man, who has only played twice this season, suffered ankle ligament damage on Thursday.

Milan head coach Stefano Pioli insists Zlatan Ibrahimovic is "certainly not a racist" but thinks his clash with Romelu Lukaku could rekindle his best form. 

Ibrahimovic was sent off having scored the opening goal in the Rossoneri's 2-1 Coppa Italia defeat to Inter this week. 

The veteran striker earned his first of two yellow cards after a heated confrontation with former Manchester United team-mate Lukaku, in which he appeared to tell the Belgian forward: "Go do your voodoo s***, you little donkey". 

It was suggested Ibrahimovic was referring to comments made in 2018 by Everton majority shareholder Farhad Moshiri, who said Lukaku had declined a contract extension because a "voodoo message" told him to move to Chelsea - a transfer that never transpired. 

Some accused Ibrahimovic of racially abusing Lukaku, with the Swede responding by stating on Twitter: "In ZLATAN's world there is no place for RACISM." United midfielder Paul Pogba also tweeted to say his old team-mate was "the last person I'd think of as racist". 

Ibrahimovic will serve a one-game ban for his red card but Pioli hopes a line can now be drawn under the incident as Milan focus back on Serie A.

"Ibrahimovic is determined and up for it, as he always is," Pioli said ahead of Saturday's game at Bologna. "Certain things can happen on the pitch; I'm not going to justify that, but you need to draw a line under it and move on. 

"Ibra is certainly not a racist; the club has always been on the front line in the fight against discrimination. Zlatan also needs these situations to get a bit of energy and motivation back." 

Milan's cup exit followed a 3-0 home league defeat to Atalanta that allowed Inter to close the gap on the leaders to two points. 

Pioli says back-to-back losses have not changed his view of his team's potential as he aims to return them to the Champions League. 

"We're not interested in what people are saying outside of the club," he said. "We just need to focus on ourselves, maintain a good balance, continue to work and improve. We know that opinions can change quickly in football. 

"It's useless to look back; we only need to look forwards. I haven't changed my mind on our quality. We have a good team and the ideas are there. We are able to put in consistently good and competitive performances, which we have shown up to now. 

"We're having a great season; we have 18 more points than we did at this stage last season and have closed the gap to our direct rivals.

"The second half of the season will be more complicated and hard-fought. Qualifying for Champions League football won't be easy, but we have the quality to do it."

Mikel Arteta is adamant Martin Odegaard's arrival does not have to negatively impact Emile Smith Rowe's form, with the Arsenal manager convinced they can play together.

Arsenal completed the loan signing of Odegaard from Real Madrid on Wednesday, the Norwegian adding creativity to a squad that had not included Mesut Ozil at all this season prior to his move to Fenerbahce.

The 22-year-old Odegaard had struggled at Real Madrid this term, making just three LaLiga starts for Zinedine Zidane after returning from an impressive temporary spell at Real Sociedad.

But there is great hope that he could make a real impact for the Gunners if he is able to rediscover the form he displayed with La Real, for whom he created a team-high 62 chances and provided six assists in 2019-20.

Despite some expressing doubts over his compatibility with Smith Rowe, Arteta believes the two can play together, while Odegaard's signing will alleviate some of the creative burden.

"Of course, they can play together, and it is not about pushing somebody else [out of the team]," Arteta told reporters ahead of Saturday's clash with Manchester United.

"Emile has earned his right to play the way he is performing - and Martin has to earn that.

"Emile cannot play every single game, as we knew the other day. For example, in the FA Cup he was injured, he could not play.

"The other day [against Southampton on Tuesday], he could only play certain minutes because he was struggling for the last minutes.

"It has been a massive step for him from what he was doing three, four months ago and what he is doing right now. We need options."

DOUBLE THREAT

Smith Rowe has enjoyed a sudden rise to prominence with the Gunners – before Christmas he was exclusively used in cup competitions, but he has started six Premier League matches in a row since.

The first of those was the 3-1 win over Chelsea on Boxing Day, a result that ended a run of seven games without a league victory and began to ease the pressure on Arteta. The Gunners are unbeaten with Smith Rowe in the side in the league this season.

His three assists from open play across the same period is more than anyone else has managed in the Premier League, so concern for Smith Rowe's momentum was an understanding by-product of the initial links to Odegaard.

But, Opta data lends credence to Arteta's assessment they can play together.

None of Smith Rowe's key passes or assists have come from the central third of the attacking half, with all of them coming from wider positions.

While Odegaard operated predominantly from the right at Real Sociedad last term, the highest proportion (31.2 per cent) of his assists and key passes came from the central zone directly outside the penalty area.

Creativity in this zone has been a weak point of Arsenal's this season, with most of their threat coming down the left – Odegaard's arrival might just offer the Gunners a little more balance.

Barcelona have been drawn away to Granada in the Copa del Rey quarter-finals.

Ronald Koeman's team fought back to defeat second-tier Rayo Vallecano 2-1 on Wednesday, earning their place in the last eight after a major scare.

Barca will now have to face a LaLiga team in Granada, a side they defeated 4-0 at Los Carmenes earlier this month.  

Sevilla, who have not won the competition since 2010, will play away to Almeria, the last team from outside the top flight left in the tournament.

Real Betis will take on Athletic Bilbao, who are yet to play Real Sociedad in the final of last season's Copa, while the other match will see Levante host Villarreal.

Ties will be played across next week from Tuesday to Thursday, with Barca favourites to win it after Atletico Madrid and Real Madrid were eliminated against lower-league opposition.

Serena Williams and Rafael Nadal agreed it was great to be playing in front of busy grandstands again as tennis stars emerged from lockdown in Australia.

The women's and men's tennis tours have been contested largely behind closed doors over the past year, and a number of tournaments, most notably Wimbledon, have been cancelled due to the COVID-19 crisis.

The Australia public has given a cautious welcome to the arrival of the world's leading players, who have been quarantining in hotel rooms for much of the past fortnight, only allowed to briefly leave in order to train.

Ahead of the Australian Open, which begins on February 8 in Melbourne, Williams and Nadal are among a star-studded set of players who travelled to Adelaide to feature in the 'A Day at the Drive' exhibition event.

They both scored victories on Friday, with Williams defeating US Open champion Naomi Osaka 6-2 2-6 10-7 and Nadal snatching a 7-5 6-4 win over Dominic Thiem.

The delight in both at seeing crowds at a tournament was plain, with Williams saying in an on-court interview: "Thanks everyone for having us. We haven't played in front of a crowd in over a year. It's been a really long time."

In fact, it has not quite been a full year since the tours locked down initially, as it was early March when most tournaments began to be called off, with crowds frozen out.

Williams said the reception made the difficult past fortnight, being hidden away from the world, worth the strain for the players.

"This is really cool and then for having us and trusting us with your laws was great," said the 23-time grand slam winner. "We were so excited to be here and it's worth it."

Nadal said he was "super happy" to still be playing at the highest level and back in front of Australian crowds.

The pandemic has been carefully managed to the point where very few have the virus and it is considered safe to allow crowds into sporting events in the country.

Nadal said: "Hopefully this situation will go away quick and we will be able to enjoy fans on court [around the world].

"We're super excited to have fans at the Australian Open and today."

That optimism and excitement was shared by men's world number one Novak Djokovic, who played just one set against Jannik Sinner due to a problem with blisters on his right hand.

Eight-time Australian Open champion Djokovic told fans: "Thank you so much for coming out and making our day and making our year.

"We didn't play in front of this much crowd for 12 months. This is definitely something very special.

"It wasn't easy, obviously, with 14 days being constrained in the room and a few hours to train, but at the end of the day it was worth it because you guys made it very special today for us."

Miami Heat coach Erik Spoelstra insisted his team still have the right spirit and a huge "sense of urgency" after suffering a fifth straight loss, going down 109-105 to the Los Angeles Clippers.

In an NBA first for the shot-clock era, the Clippers won a game despite being outscored by 14+ points in the first and fourth quarters, according to Stats Perform data. 

The Heat fell to 6-12 for the season having been beaten by a Clippers team playing without Kawhi Leonard, Paul George and Patrick Beverley. 

Spoelstra was also without key players; Jimmy Butler, Goran Dragic and Andre Iguodala were among seven who were unavailable. 

The Clippers trailed by 18 early, but then turned the tables and built a lead as high as 19 by the time the third quarter ended.

However, the Heat won the fourth quarter by 15 points and were within three before ultimately losing out in a frantic finale. 

The struggles this season are a stark contrast to last, when they impressively made the NBA Finals in the Orlando bubble. 

"When it went good, it was because their hearts are in the right place for sure," said Spoelstra. 

"We are just grinding and trying to figure out how to get over the hump and try and give ourselves our best chance of winning.  

"It is just a matter of consistency to be able to do that throughout the course of the game.  

"Our group has a great spirit and a big-time sense of urgency. It is not a matter of that, it is a matter of finding a way to be consistent throughout. 

"There are a lot of moving parts. That makes it unique. You can’t make an excuse for it. You have to continue to grind, to learn and compete for each other. We just need to be more consistent with it."

Tyler Herro had 19 points as he returned after missing seven games with neck spasms, with Spoelstra hoping more players will follow soon. 

He added:  "We will be getting guys back soon enough. You get Tyler back and there is just a boost to it and that is encouraging.  

"Everyone in the locker room really wants to play better and in a perfect world we want to be in a better place than we are right now and we are not.  

"We just have to continue to grind." 

Nicolas Batum scored 18 points for the Clippers, one of their six players to reach double figures. Tyronn Lue's team improved to 14-5 on the season and have won eight of their last nine games.

Roy O'Donovan scored his first goal as an Australian citizen to earn Newcastle Jets a 1-1 draw against Western Sydney Wanderers.

The former Republic of Ireland B striker fired in an 81st-minute penalty to give the lowly Jets the reward their second-half endeavour deserved.

Former Newcastle frontman Bernie Ibini, who left the Jets in December, had pounced in the 36th minute at Bankwest Stadium to give Wanderers the lead in the A-League clash.

Ibini drove home after Simon Cox went on a weaving run that ended with a 20-yard low shot against the left post, the ball bouncing out kindly for the experienced striker to convert.

Wanderers would have gone top of the table had they held on for three points, but after having much the better of the opening 45 minutes their level dipped in the second half.

Jets substitute Luka Prso was clipped in the penalty area by Patrick Ziegler, who was also freshly off the bench, and O'Donovan snatched the chance to secure a point, firing high into the left corner.

O'Donovan, 35, announced this week that his citizenship had come through, having spent the last five and a half years playing in Australia.

The point nudges Wanderers up to second place after five games, albeit having played one more match than the teams around them.

For the Jets it was a first draw of the campaign after one previous win and four defeats.

LeBron James revealed the Los Angeles Lakers are having to learn on the fly during the regular season after the defending NBA champions slipped to a second successive defeat.

Without Anthony Davis, who did not play due to injury, and off the back of a narrow loss to the Philadelphia 76ers, the Lakers made a strong start but faded badly at the Detroit Pistons on Thursday.

James made his first seven shots but had just two points in the second half, the Pistons running out comfortable winners by a 107-92 scoreline for just their fifth victory of the campaign.

For the four-time NBA MVP, however, it is all about the bigger picture, rather than one-off results. With limited practice time available to teams due to the altered schedule amid the ongoing coronavirus pandemic, and a number of new faces having joined during the offseason, the Lakers are having to experiment during games.

"We are all learning on the fly due to the lack of practice time," James said.

"You know with this season it's very difficult to get those practice minutes on the floor and know what does and doesn't work. It's very strange with that.

"We are definitely all adjusting to playing with different line-ups and logging minutes with line-ups that in one game you may not have played with, then it could be [the case] for a few games in a row.

"A lot of our games are also big practices for us too, we have to learn on the fly and coach is still learning different line-ups, which combinations work.

"Myself, I'm out here with certain line-ups I do play with, certain ones I don't. It's all a learning experience and trying to figure things out."

James, who finished with 22 points and 10 assists, insisted his second-half output was not due to tiredness. Far from it, in fact.

"I don't feel tired. I get my sleep, I get my rest. I have a lot of energy, I don't get tired," said the 36-year-old, who revealed during his post-game press conference that he likes to watch shows and drink a glass of wine to relax.

"My mindset never gets to the point where it's a long road trip and I'm exhausted and tired, I don't even think about that. When we have our games, I'm ready to go.

"When we're not playing, I have an opportunity to rest, get my body back right and my mind refreshed. I don't get tired."

Kyle Kuzma also had 22 points for the Lakers, while Blake Griffin led the way for Detroit with 23.

The Los Angeles Lakers slumped to back-to-back losses in the NBA, while the Clippers got past the Miami Heat on Thursday.

The Lakers dropped two straight games for the first time this season, beaten 107-92 by the Detroit Pistons.

LeBron James posted a double-double of 22 points and 10 assists, to go with seven rebounds, but the Lakers were beaten.

A day after losing to the Philadelphia 76ers, the Lakers were without Anthony Davis (quad).

Blake Griffin (23 points) and Mason Plumlee (17 points and 10 rebounds) led the Pistons (5-14) to their surprise win.

The Lakers (14-6) are third in the Western Conference, behind the Utah Jazz (14-4) and Clippers (14-5).

Still without Kawhi Leonard and Paul George due to the NBA's health and safety protocols, the Clippers recorded a 109-105 win over the Heat.

They had six players in double-figures for points, with Serge Ibaka (10 points and 13 rebounds) finishing with a double-double.

The Clippers became the first team in the shot-clock era to win a game despite being outscored by 14-plus points in the first and fourth quarters, as per Stats Perform.

Awesome Oladipo leads Rockets, Curry's Warriors crushed

Victor Oladipo finished with 25 points, seven rebounds and five assists in the Houston Rockets' 104-101 win over the Portland Trail Blazers.

Damian Lillard (30 points, nine assists and four rebounds) led the way for Portland.

Stephen Curry posted 27 points, but the Golden State Warriors were well beaten by the Phoenix Suns 114-93.

Warriors' woes

Kelly Oubre Jr. (one-of-11) and Draymond Green (one-of-seven) struggled from the field for the Warriors, combining for just six points.

Wood with the dunk

Christian Wood continued his good form with 22 points, including a big dunk, and 12 rebounds for the Rockets.

Thursday's results

Houston Rockets 104-101 Portland Trail Blazers
Detroit Pistons 107-92 Los Angeles Lakers
Los Angeles Clippers 109-105 Miami Heat
Phoenix Suns 114-93 Golden State Warriors

Nets at Thunder

The Brooklyn Nets (12-8) are riding a three-game winning streak ahead of facing the Oklahoma City Thunder (8-9) on Friday. Nets stars Kevin Durant and James Harden are set to come up against their former team.

Novak Djokovic apologised but confirmed he had been dealing with a blister after only playing a set of his exhibition match in Adelaide.

The world number one had reportedly withdrawn and was replaced by Filip Krajinovic for a clash against Jannik Sinner.

But Djokovic played the second set, winning it 6-3 after Krajinovic had taken the opener 6-3 on Friday.

The 17-time grand slam champion, who had a blister on his right hand, apologised after the match.

"I'm sorry that I didn't step in on the court from the beginning," Djokovic told Channel 9.

"I had to do some treatment with my physio and wasn't feeling my best the last couple of days, I didn't know how I'm going to react.

"I wanted to play and I wanted to get out here and hopefully it was enough for you guys to see all three of us performing in front of you on the court today, I hope you enjoyed."

Djokovic, who came out of hotel quarantine on Friday, said he could not pass up the opportunity to play in front of fans.

"It's not easy but it's part of what we do. We are professional athletes we learn over the years to play with the pain and it's just a question and case whether that pain is bearable or not," he said.

"Obviously coming off from the hard training block and having an ATP Cup and Australian Open around the corner you don't want to risk it too much.

"But the emotion was so strong in me to come out on the court today seeing almost full stands, I had to play, that's it, I had to play."

Djokovic is due to play the ATP Cup starting on Tuesday, before the Australian Open begins on February 8.

Mauricio Pochettino denied he had turned down chances to coach Real Madrid and Barcelona.

Pochettino has been linked with the LaLiga giants previously, although he took over at Paris Saint-Germain at the start of the month.

But Pochettino said reports he had turned down Madrid and Barcelona were untrue.

"This is not the case, although there was a lot of talk at the time," he told Marca.

"We have a lot of respect for the teams that may have been interested in our staff.

"It wasn't like that and of course I have been approached by clubs, but the one we received with love was from PSG. And this is the ideal project."

After spells in charge of Espanyol and Southampton, Pochettino was at the helm of Tottenham for five and a half years before being sacked in November 2019.

He has overseen four wins in five games since taking charge of PSG, who are top of Ligue 1 ahead of visiting Lorient on Sunday.