Jose Mourinho warned Tottenham would be left in an "impossible situation" if their game at Aston Villa is postponed due to a COVID-19 outbreak and called on the Premier League to show "leadership".

Villa are expected to field a young side in the FA Cup third-round tie against Liverpool on Friday, as a large number of first-team players and staff tested positive for coronavirus this week.

Spurs already had a derby at Fulham called off on December 30 after the Cottagers were hit by the virus and a scheduled trip to Villa Park next Wednesday is now in doubt.

Tottenham will also face Manchester City at a later date of April 25 due to the pandemic and given they are fighting for honours on four fronts, Mourinho suggested they would refuse to accept any more postponements.

Speaking ahead of Sunday's FA Cup tie at Marine, he said: "I believe that is a completely impossible situation for a club to have three matches postponed, especially if that club plays in Europe. If that club doesn't play in Europe, of course there are the UEFA fixtures.

"For a Europa League team to have three matches postponed is impossible. Completely impossible. That's the only thing that I can say."

Asked about the prospect of facing Fulham instead of Villa, he added: "I don't know. It's not for me to find solutions. I'm not going to lie to you, I've been doing that hypothetical exercise with my staff.

"Of course, we have no influence and we don't want to have influence. The only thing that we can say is that what we did in the beginning of the season is impossible to repeat and we refuse to repeat.

"We have to defend our players, the integrity of our competitions and we would never accept to play seven matches in three weeks like we did before. One thing is [the] beginning [of the season], another thing is mid-season.

"And also because of the difficulties and demands of the matches. One thing is to play with all the risks, the Europa League play-offs, another thing is to play Europa League knockout where all the best teams are there.

"We cannot be put in an impossible situation. To have three matches postponed... it is the moment for the Premier League to show leadership, make decisions, that of course a club like us, is trying every day to be ready to play, to follow the rules that we had in our hands.

"We cannot be punished. If we don't play against Aston Villa, we will have three matches postponed and that is impossible. Because after the season we have the Euros, and of course the matches cannot be moved."

Mourinho revealed Gareth Bale trained on Friday and could travel to eighth-tier minnows Marine, while Jack Clarke and Harvey White will be in the squad.

Jurgen Klopp says he has no problem with Liverpool not dipping into the transfer market in January as owners Fenway Sports Group are only acting in the best interests of the club. 

The Premier League champions have been badly depleted this season, particularly in the heart of their defence with Virgil van Dijk and Joe Gomez long-term absentees and Joel Matip struggling to stay fit. 

Klopp is unlikely to add to his squad during the mid-season window, but the Reds boss understands it is difficult to do business at this time even without the financial impact of the coronavirus pandemic. 

The Liverpool boss insists he is on the same page as club ownership, no matter the key absences that could undermine their push for trophies. 

"In good times everyone thinks our owners are really generous – 'My God, big signings, whatever’ – and in bad times everyone thinks they are really tight – maybe because they are from a different country – but they are not, they are absolutely concerned about the club and success of the club," Klopp said. 

"And that is an understanding how we have it. They see exactly the same things I see about necessity of players and stuff – it's not that I say 'By the way a centre-half would be really nice’ and they say, 'Wow, a centre-half. Really? Why?' 

"It is all clear, all on the table, we work on that. It is the situation and on top of that we have January, not the easiest transfer window, having not the money exactly like we want. 

"It is a window where other clubs say, 'No, we have enough [money] to survive' so we don't do anything on our targets. 

"It is nothing to do with worrying [about whether it will impact their chances of winning trophies] or not. These are the facts.

"My job is to deal with the circumstances which I always do. If the world would be in a completely normal place, we would try everything to do the right stuff now but the world is not in a normal place so I don't know why we constantly try to treat the football like it is independent of other issues around."

Liverpool are due to be in FA Cup action on Friday, though their tie with Aston Villa is in doubt due to a coronavirus outbreak in their opponents' camp.

Villa announced on Friday they had closed their training ground as a consequence, while the Football Association will make a decision on whether the game goes ahead following further testing.

The Football Association (FA) is still hopeful Aston Villa's meeting with Liverpool can go ahead as planned on Friday, with a final decision to be made after further coronavirus testing.

Villa announced on Thursday they had closed their Bodymoor Heath training ground after "a significant coronavirus outbreak" at the club, with first-team training cancelled after players and staff returned positive results.

Their FA Cup third-round clash with Premier League leaders Liverpool was consequently thrown into doubt, though it is hoped the fixture will not have to be postponed.

An FA statement read: "The Football Association and Aston Villa are working closely together to try to ensure that the club's FA Cup third round proper fixture with Liverpool can go ahead as planned at Villa Park.

"Final confirmation will be made tomorrow pending the results of additional COVID-19 testing."

It was announced earlier on Thursday that the third-round clash between Shrewsbury Town and Southampton would not go ahead on Saturday after "several" members of the League One side returned positive coronavirus results.

Derby County this week revealed they will select a side made up of Under-18 and Under-23 players for their tie at non-league Chorley on Saturday, with interim boss Wayne Rooney and his first-team squad staying at home following a coronavirus outbreak at the Championship club.

Liverpool are set to stick with their threadbare options at centre-back rather than recruiting a January replacement for Virgil van Dijk or Joe Gomez. 

The Reds have played much of the season so far with midfielder Fabinho in defence alongside a rotating cast of partners after long-term injuries to their starting duo. 

Joel Matip has been limited to just eight Premier League appearances due to his own fitness issues and is facing a race to be back for a vital game against Manchester United next week. 

Academy graduates have stepped in, with Nathaniel Phillips playing three times and Rhys Williams twice in the league, while captain Jordan Henderson lined up at centre-back in Monday's defeat to Southampton. 

Although Henderson and Fabinho won nine of the 11 duels they contested between them in that match and still ranked second and third for total touches, it is not an ideal fix. 

And such issues have prompted reports of interest in Schalke's Ozan Kabak and Lille's Sven Botman, although The Athletic reported on Thursday that Liverpool will not pursue either option in the mid-season window. 

Jurgen Klopp said prior to the game against Southampton that the club would do "the right thing" this month - and that appears to mean opting against a new signing. 

Asked if he could rule out a transfer as he previewed the scheduled trip to Aston Villa in the FA Cup, Klopp replied: "I cannot say definitely we will not bring one in. It's just not likely because of the situation in the world. 

"We should not forget that the [coronavirus] situation is a tough one for all people and for football clubs as well.

"There might be some clubs with absolutely no financial problems, but this club always was and will always be - with these owners, for sure - very responsible with the things we do. 

"If the world would be in a normal place, everything would be fine, we won the league, won the Champions League, the club is in the best possible situation, and you have three senior centre-halves all injured, is that a situation where you would normally do something? Yes, definitely. 

"But we are not in that situation, so I don't know if something will happen or not. 

"We maybe could do something, but it would be a short-term solution and we don't have a short-term solution, so it's not right because it does not help. 

"We have to get through this. It's not the best moment for the whole planet, so why should it be for this football club?" 

While rotation has been enforced in the middle of the defence, full-backs Trent Alexander-Arnold and Andy Robertson have remained automatic picks. 

Alexander-Arnold tested positive for COVID-19 in pre-season and has also battled a calf injury, yet has still played 15 of Liverpool's 17 league matches. 

The right-back's performance level has dipped this season and his first error leading to a goal handed Southampton a 1-0 win on Monday. 

There was criticism of Alexander-Arnold after that match, in which he was substituted, and Klopp acknowledged on Thursday it was "not his best game", though backed the England international to recover. 

"The reason is he was out for a while with COVID and had an injury which didn't help," Klopp said. "He had no pre-season really. 

"Then with the quality he has and the situation we were in, he played pretty early. He's now getting there. 

"Physically he's fine, he just has to find his top shape again, and that will happen sooner rather than later."

Aston Villa closed their training ground on the eve of Friday's FA Cup third-round clash with Liverpool due to a "significant" coronavirus outbreak.

Villa on Thursday revealed a large number of first-team players and staff are isolating after testing positive for COVID-19 this week.

The first team did not train the day before they are due to face Premier League champions Liverpool at Villa Park and talks are being held over the scheduling of the tie.

"Aston Villa can confirm that the club has closed its Bodymoor Heath training ground after a significant coronavirus outbreak," a club statement said.

"A large number of first team players and staff returned positive tests after being routinely tested on Monday and immediately went into isolation.

"A second round of testing was carried out immediately and produced more positive results today.

"First team training ahead of tomorrow's FA Cup match with Liverpool was cancelled.

"Discussions are ongoing between medical representatives of the club, the Football Association and the Premier League."

Jurgen Klopp acknowledged Liverpool are enduring a tough run but insisted performances have not been as bad as results suggest.

The defending Premier League champions are top of the table again but have won just two of their past six matches – and two of seven in all competitions.

Rivals Manchester United, who have a game in hand, have moved level on points with the Reds at the summit ahead of the two sides meeting next weekend.

"We were not waiting for [this run of form] and we do not enjoy it, but it's not unlikely that these kinds of things happen," Klopp told a news conference on Thursday.

"I think we only won two of the last six – that's not the standard we expect from ourselves, obviously.

"So, we don't take it easy, but we still see what we can improve, what we have to improve, and don't think everything was bad in the last few weeks.

"The league is too strong, and if you struggle a little bit, immediately the results go the other way because the opponents are fighting with everything they had. You saw that against Southampton [a 1-0 defeat on Monday]."

Liverpool must first focus on the FA Cup, however, with Aston Villa hosting Klopp's men in the third round on Friday.

Last season's run to round five was Liverpool's best under Klopp, with the Anfield outfit eliminated from four of their past six ties against fellow Premier League sides, only beating Everton (in 2018 and 2020) in this time.

The Reds had reached the semi-final in the final season before Klopp's appointment, losing to Villa in the last four to end a six-match winning run against Friday's opponents in the competition.

Despite his underwhelming record in the competition, the manager says Liverpool have always been determined to succeed.

"It's important. It's the FA Cup," he said. "We didn't go far so far in this competition.

"I didn't think we were blessed so far with sensational draws so far and now we go to Aston Villa, which is a tough one as well.

"We always took it very seriously and will do this time as well, but we cannot forget the intensity of the period we are in and all these kinds of things.

"It's important – football games are important. We are professional football players or coaches or managers and the only thing we have to do is to win football games and to try to make sure that we really can do that. It's a very important competition, so we will try to win that."

Liverpool were beaten 7-2 by Villa in the Premier League this term, shipping seven goals in a single match in any competition for the first time since 1963.

Klopp is therefore reluctant to name a weakened team, even with the United game on the horizon.

"We need to find the balance to field a team where we didn't change too much," he said. "We bring in fresh legs again.

"The rhythm [for returning players] is a different issue. That's step by step. We cannot do that in one game. We can't use the FA Cup to give players rhythm – the opponent is just too strong for that.

"After the Aston Villa game, we have eight days between Villa and Man United, so that's a long training week where we can do a lot of stuff in 11-v-11 situations, which will help the players a lot, especially the players who were out for a while. After that, we will be in a different place."

Pressed on specific injuries, Klopp added Naby Keita would return "soon" but not this weekend and Liverpool "will try" to have Joel Matip back for Manchester United, although Diogo Jota is still wearing a brace on a damaged knee.

Aaron Wan-Bissaka could be key to Manchester United's chances in the New Year's Day clash with Aston Villa, as he will likely be at least partly responsible for keeping Jack Grealish shackled.

Grealish has been a standout player in the Premier League this season, with their exceptional start to the 2020-21 campaign in no small part down to the attacking midfielder's influence.

Only five teams have scored more than Villa's 28 goals this term, though four have played two more matches than them. The other, United, have played one game extra.

Grealish has scored five and set up six, excelling in his free-roaming role from the left as he has also created 51 chances in the Premier League – Hakan Calhanoglu (53) of Milan is the only player to have played more key passes across Europe's top five leagues.

Of those 51 chances created, 23 have come following a carry, defined by Opta as a movement of the ball that is greater than five metres from where it was received. No other player in the Premier League has produced more than 13 key passes from comparable situations.

Grealish impressed against United at Old Trafford last term, scoring a gorgeous goal in a 2-2 draw, and Wan-Bissaka is primed for a potentially decisive tussle with the England international, as the right-back delved into the data with United Review.

"I know he is always up there with getting the most fouls," Wan-Bissaka said of Grealish, whose 65 free-kicks won is comfortably the most in the Premier League. "We all know he’s a tricky player when he's out there on the pitch.

"He is a great player. He's unpredictable and can go inside or outside with the ball. I played against him last season and just have to be ready to take it as it comes.

"It is another challenge I am more than ready to take on, but he's not the only player we need to be paying attention to – they have lots of other good players like John McGinn, Ross Barkley, Trezeguet and others. We know it will be a tough game."

While Wan-Bissaka expects a testing encounter, Grealish surely will not be predicting an easy ride either – Opta revealed on Thursday that the United right-back made the most tackles (96) in the Premier League for a third successive calendar year in 2020.

On top of that, Wan-Bissaka's 50 blocks is a league-high for 2020-21, highlighting the full-back's defensive nous.

"I reckon it's probably down to there being situations where I've needed to tackle but, in that moment, there have been more situations I have had when I have had to block shots and crosses," he continued.

"I know there have been times in football where, if you don't block a shot, it can go in. So, the best thing to do is simply to attempt to block every shot and every cross.

"I know you cannot just dive into any tackle. You've got to make sure you time it right. It is a case of always concentrating and making sure you are timing them right as well.

"It's very good to hear, that I have had no bookings against me this season."

Despite his obvious defensive strengths, there remain plenty of United fans unconvinced by Wan-Bissaka's suitability as the club's first choice at right-back due to his limited attacking output.

He had seemingly improved as an attacking outlet in his first season at United from his days at Crystal Palace, with chance creation up to 0.7 per 90 minutes from 0.4 and open play crosses increasing to three per game from 1.6.

But he is yet to record an assist this season and his 0.3 expected assists (xA) figure further highlights how little impact he has in the final third.

Manchester City are reportedly planning a bid for Harry Kane, while United are still interested in Jack Grealish.

City have been linked with numerous forwards amid uncertainty over Sergio Aguero's future.

And it seems the Tottenham star is among their targets.

TOP STORY – MAN CITY PLANNING £88.7M BID FOR KANE

Manchester City are planning an £88.7million offer for Tottenham star Kane ahead of next season, according to Bild.

Kane, 27, is contracted at Spurs, where he continues to star, until 2024.

The England international has scored nine goals in 15 Premier League games this season.

ROUND-UP

- Manchester United remain interested in signing Aston Villa star Grealish, according to the Daily Mail. The midfielder was heavily linked with a move to United in the close season, but ended up staying at Villa, who are in action at Old Trafford on Friday.

- Eric Garcia has seemingly made a decision on his future. The Guardian reports the Manchester City defender has agreed personal terms on a five-year deal with Barcelona. Garcia is contracted at City until the end of the season.

- With Mauricio Pochettino reportedly set to take over at Paris Saint-Germain, Tottenham apparently have worries over Hugo Lloris. The Sun reports Spurs fear the goalkeeper could join former boss Pochettino in Paris and they are eyeing West Brom's Sam Johnstone and Manchester United's Dean Henderson as potential targets.

- Yet to play for Arsenal this season, Mesut Ozil's future remains a talking point. Bild reports the playmaker wants to see out his contract, which runs until season's end, with the Premier League outfit.

- Also coming out of contract, Sami Khedira looks set for a Juventus exit. The Daily Mail reports the midfielder is set to hold talks with Everton over a potential move.

- Struggling for game time at Manchester United, Jesse Lingard has had the one-year option on his contract at the club triggered, according to Sky Sports. Lingard's deal now runs until 2022.