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.

Finally, 2020 is history - there won't be many people who aren't happy to see the back of a difficult year.

While the coronavirus pandemic shows no sign of making a swift exit, the turn of the year at least gives us the chance to look forward, and the same is true in the world of sport.

2020 saw many promising young players make the step up, some undoubtedly down to the absences caused by coronavirus or the packed schedule that the pandemic has led to.

We've picked out 21 under-21 players to keep an eye on in 2021 - and while you may already be familiar with some of them, there's good reason to give them your attention this year...

Illan Meslier, 20 - Leeds United

Few goalkeepers can come away from a 6-2 defeat having impressed, but Meslier did so against Manchester United recently. His eight saves prevented Leeds' crushing loss from getting even more embarrassing, while only three goalkeepers have produced more in a single Premier League match this term. His total of 63 is also the second most in the division – the France Under-21 talent, who joined on a permanent deal from Lorient last year, appears to have a big future ahead of him.

Kristoffer Klaesson, 20 - Valerenga

Goalkeepers tend to break through a little later than outfield players, but Norway youth international Klaesson has already been first-choice at Valerenga for the best part of 16 months – he only turned 20 in November. Coincidentally, he could have become a team-mate of Meslier's in 2020 as Leeds were reportedly interested, but he remains in Norway for the time being.

William Saliba, 19 - Arsenal

Saliba is certainly one of the most recognisable names on this list – after all, he has been owned by Arsenal for getting on for two years. Unfortunately, he has not been afforded much of a chance by Mikel Arteta this term, which makes him an interesting prospect to watch in 2021. Either he'll eventually get an opportunity at the Gunners, or a loan move will provide him with a crack at first-team football. After a tricky 2020, he'll want to get his career back on track.

Perr Schuurs, 21 - Ajax

Given his appearance, playing style and the fact he has come through Ajax's academy, comparisons between Schuurs and Matthijs de Ligt were to be expected. He may not reach the Juventus star's level, but he has certainly shown real promise that is reportedly interesting Liverpool. Schuurs is one of the five youngest players to have featured for at least 500 minutes in this season's Champions League, while his 47 ball recoveries was the sixth highest of any player in the group stage.

Ethan Laird, 19 - Manchester United

Aaron Wan-Bissaka was supposed to fix Man United's issues at right-back, but this season his defensive positioning has been concerning and he appears to have become even less effective in attack – his chances created and open-play crosses per 90 minutes have decreased significantly. Laird has long been considered a fine prospect at United and boasts the technical abilities to be a threat in attack. If he can stay fit, chances could be in the offing.

Tariq Lamptey, 20 - Brighton and Hove Albion

Having joined Brighton last January from Chelsea, Lamptey has quickly made a name for himself as an exciting wing-back. Last year saw the diminutive talent enjoy something of a breakthrough, but in 2021 he'll be looking to truly establish himself and potentially break into the England squad. There are few more exhilarating full-backs in the Premier League – his 3.8 dribbles per game is the third most among defenders to have featured more than twice.

Nuno Mendes, 18 - Sporting CP

Sporting have a wealth of talent coming through at the moment and left-back Mendes is arguably chief among them. Blessed with fine technical abilities, the 18-year-old is apparently a target for Man United, Liverpool and Real Madrid. Already a regular having started 10 of the Primeira Liga leaders' 11 games this term, Mendes' 10 completed dribbles is the fourth-highest among defenders in the division, while his 28 interceptions is second only to team-mate Luis Neto.

Gabriel Menino, 20 - Palmeiras

An intriguing player with a well-rounded skillset, Menino has already transitioned from centre-back to defensive midfield to right-back despite his young age. It is in the latter position where he impressed enough to earn a first Brazil call-up last year and only two players have provided more than his five assists in the 2020 Brazilian Serie A.

Moises Caicedo, 19 - Independiente del Valle

The past month or so has seen Caicedo brought to the attention of a wider audience – or, more specifically, Manchester United fans. The all-action midfielder was the teenager with the most goals (four), shots attempted (24), chances created (19), successful passes (748) and dribbles completed (23) in Ecuador's top flight in 2020, while his passing accuracy of 90.1 per cent was the highest among players to attempt 500 or more.

Billy Gilmour, 19 - Chelsea

Scottish talent Gilmour had shown real promise during his 11 Chelsea appearances last season before a knee injury in July laid him low. He returned to action last month with a few cameos off the bench, and there will be plenty hoping he can return to his previous level quickly. A loan move might be on the cards, but Frank Lampard has high hopes for the crafty midfielder.

Yunus Musah, 18 - Valencia

Valencia are going through another difficult spell, with off-field matters often overshadowing on-pitch performances. Nevertheless, in United States international Musah, they appear to have a reason for optimism. Another tricky winger, Musah's 38 dribbles is the second most among Los Che players this term and he became their youngest LaLiga goalscorer (17 years, 338 days) this century when netting back in November. He's one that got away from Arsenal.

Ander Barrenetxea, 18 - Real Sociedad

A nimble right-footed left-winger, Barrenetxea broke into La Real's senior side last season with 17 appearances in LaLiga. His eight starts this term is already an increase of five on the entirety of 2019-20 and he has been using that extra time on the pitch to excite. He has attempted 41 dribbles in LaLiga, and his 56 per cent completion rate is bettered by only seven players – all of whom are much older – among those to have tried at least 40.

Bryan Gil, 19 - Eibar (on loan from Sevilla)

If Barrenetxea embodies the modern 'inverted winger' style, then Bryan is very much a wide midfielder of the classic variety. A direct touchline-hugger, the left-winger's aim is almost always to beat his man and get a cross into the box, and he is catching the eye on loan at Eibar this term. Only five wingers in LaLiga can better Bryan's 49 open-play deliveries, though his 22.5 per cent accuracy is better than all but one of those with more cross attempts. He's also tried 44 dribbles, his 52.3 per cent completion putting him close to Barrenetxea.

Jaminton Campaz, 20 - Deportes Tolima

Campaz may not be a household name yet, but a move to Europe or one of South America's leading leagues is surely not far away. The attacker, who can play wide or through the middle, is an explosive player but also productive. No younger player had more goal involvements (five goals and four assists) and chances created (32) in Colombia's top division than Campaz.

Amad Diallo, 18 - Manchester United

Although United splashed a reported £19million on Diallo, the young Ivorian remains something of an unknown quantity. A left-footed right-winger, he has only been given a handful of opportunities in Atalanta's senior side – though he has often caught the eye with his ability on the ball. Given United's lack of options on the right flank, he might just establish himself sooner than some expect – either way, he will be one to monitor.

Pedri, 18 - Barcelona

As each week passes, more and more Pedri looks to be settling into the role as Lionel Messi's heir at Barcelona, but whether he's ready to take up such a mantle as early as this year is another matter. Messi's contract ends in June and so he could well depart – taking on his creative burden would be an unenviable task for a teenager, though Pedri is proving effective. He is creating a chance every 45 minutes on average in the league this term, the third most frequent in the squad among those to have played at least five times.

Talles Magno, 18 - Vasco da Gama

Are you really a Brazilian 'wonderkid' if you've not been linked with every major European club? Talles Magno fits the bill there and it's easy to see why there's interest. His end product still needs work, but his ability to excite is considerable – the 18-year-old has completed more than twice as many dribbles (106) as any other teenager in Brazil's Serie A between 2019 and 2020.

Karim Adeyemi, 18 - Salzburg

There has been a buzz around Adeyemi for a few years now as has previously impressed scouts with Germany's youth sides and during a fruitful loan spell at Liefering. Now back at Salzburg, he looks destined to be another serious talent off the club's impressive conveyor belt. Adeyemi is the only player to have been involved in four goals in a single Austrian Bundesliga this term, scoring and getting a hat-trick of assists in the 8-2 victory over St. Polten, while he set up a goal on his league debut for the club in June. A thrilling talent with great vision and dribbling abilities, Adeyemi may get even greater responsibility in 2021 following the departure of Dominik Szoboszlai.

Marcos Leonardo, 17 - Santos

It's still early days for Marcos Leonardo, though Santos clearly rate him highly – the striker's release clause is €100m. He's already the underage player with the most minutes played (296) and goals (one) in Brazil's top division this season, while he became the sixth youngest player to net in the Copa Libertadores (17y, 173d) when scoring a winner against Defensa y Justicia.

Youssoufa Moukoko, 16 - Borussia Dortmund

There's not much that hasn't already been said about Moukoko. He became the Bundesliga's youngest ever player in November when making his debut a day after his 16th birthday, before then also setting a new record for the league's youngest goalscorer in December. New coach Edin Terzic has already given him two starts – his next target will be to break records on the international stage with Germany. He couldn't get into their Euros squad, could he?

Matias Arezo, 18 - River Plate (URU)

Stocky, technically gifted and already proving decisive in front of goal with seven goal involvements (five goals, two assists) in 15 league matches, Arezo has a lot going in his favour. Whether he has the mentality or focus to not let the 'new Luis Suarez' labels distract him remains to be seen, but he's already the youngest Uruguayan (17y, 349d) to ever score a brace in the Copa Sudamericana having done so against Atletico Nacional in November.

Bobo has returned to Sydney FC, joining the A-League club for a second stint.

The Brazilian striker enjoyed a successful spell at the club between 2016 and 2018, winning two premierships, a championship and an FFA Cup.

Bobo, who turns 36 on January 9, won the A-League Golden Boot in 2017-18.

The former Besiktas and Gremio striker has had spells at Alanyaspor, Hyderabad FC and Oeste since leaving Sydney, but his return for the 2020-21 campaign was confirmed on Friday.

"I enjoyed every moment of my time at Sydney FC, we had a hugely successful two seasons and I want that again," Bobo said.

"The club has hardly missed a beat since, winning both A-League titles and the Premiers' Plate and I can't wait to go for three in a row.

"My family and I still feel like members of the Sky Blue family and for us this is like a journey home.  

"We are looking forward to seeing everyone, particularly all of our members again, and to get going on another exciting ride."

Bobo scored 42 goals in 57 A-League games during his previous stint. Besart Berisha (35) was the next best over the same period.

Of Bobo's goals, 10 were headers, while all 42 came from inside the box. It included 11 penalties.

Sydney begin their A-League campaign against Wellington Phoenix on Saturday, but Bobo is set to complete quarantine and be available for the derby against the Western Sydney Wanderers on January 16.

John Wall impressed on his Houston Rockets debut, while the Philadelphia 76ers' fine start to the NBA season continued.

In his first regular-season appearance since December 2018, Wall helped the Rockets to their first win of the season with a 122-119 victory over the Sacramento Kings on Thursday.

Wall posted 22 points, nine assists and six rebounds on his Rockets debut after being traded from the Washington Wizards at the start of December.

James Harden again starred, finishing with 33 points, eight assists and six rebounds.

The 76ers improved to 4-1 and handed Orlando their first loss of the season, beating the Magic 116-92.

Joel Embiid was seven-of-11 from the field for 21 points, while he also pulled down nine rebounds.

Westbrook's Wizards fall again as Booker shines

Russell Westbrook posted another triple-double with 22 points, 11 assists and 10 rebounds, but the Washington Wizards dropped to 0-5 after a 133-130 loss to the Chicago Bulls. Westbrook joined Oscar Robertson as the only players in NBA history to open a season with four triple-doubles in their first four games.

Thomas Bryant had 28 points for the Wizards after going 10-of-11 from the field.

Devin Booker's game-high 25 points helped the Phoenix Suns past the Utah Jazz 106-95. The Suns are 4-1.

Domantas Sabonis had a double-double of 25 points and 11 rebounds in the Indiana Pacers' 119-99 win over the Cleveland Cavaliers. Sabonis has posted at least a double-double in all five of his games this season.

Terrible Thunder

The Oklahoma City Thunder shot at just 37.5 per cent from the field in a 113-80 loss to the New Orleans Pelicans.

Harden, Wall power Rockets

Harden and Wall finished with 55 points and 17 assists between them against the Kings.

Thursday's results

Indiana Pacers 119-99 Cleveland Cavaliers
Chicago Bulls 133-130 Washington Wizards
Philadelphia 76ers 116-92 Orlando Magic
Houston Rockets 122-119 Sacramento Kings
Toronto Raptors 100-83 New York Knicks
New Orleans Pelicans 113-80 Oklahoma City Thunder
Phoenix Suns 106-95 Utah Jazz

Lakers at Spurs

The Los Angeles Lakers (3-2) and San Antonio Spurs (2-2) will meet again on Friday. LeBron James powered the Lakers to a win over San Antonio on Wednesday.