The January transfer window can come as a blessing to many teams as it gives them the opportunity to strengthen amid times of need.
However, it can also be a curse, especially if your club loses its most influential player mid-season.
Each team in the top flight has at least one indispensable star the fans cannot bare to see go.
He may not be the most talented player within the squad, but he would certainly leave the biggest whole once gone.
Starsport looks at the one player each Premier League club cannot afford to see sold in before the window shuts.
Arsenal – Pierre-Emerick Aubameyang
With 15 goals to his name in all competitions, only one Arsenal player can boast having either half that figure this season – Gabriel Martinelli.
The skipper has even been linked with a move away to Inter Milan this month as his contract continues to run down.
While Mikel Arteta is in the transition process and trying to get the best out of his team, he desperately needs Aubameyang's quality and potency to keep shining through in their bid for a top-four finish.
Aston Villa – Jack Grealish
This has become all the more obvious an answer off the back of season-ending injuries to No.1 goalkeeper Tom Heaton and sole striker Wesley.
While John McGinn has been nothing short of a sensation for Villa, his recent absence and Grealish's crucial contributions in attack alongside his leadership and importance to supporters makes him truly indispensable.
Villa would be wise to tell Manchester United there is no use enquiring while their Premier League status is on the line.
Bournemouth – Nathan Ake
Eddie Howe's side are in free fall, and it's no coincidence that drop in form has coincided with the loss off Ake to injury.
The centre-half has been a revelation at the back for Bournemouth since joining from Chelsea – so much so they are considering exercising the buyback clause in his contract.
Losing Ake short-term on the treatment table has been one thing, but for it to happen permanently as Manchester City hover too would be devastating for the relegation-threatened Cherries.
Brighton – Lewis Dunk
While Graham Potter's team have shown a real determination to work as a unit while also playing more attractive football this term, one man at the back highlights their heart.
Dunk is everything a team in the bottom half of the Premier League would want in a centre-half, and even offers a threat from set-pieces at the other end.
Burnley – Nick Pope
The likes of Chris Wood and Ashley Barnes have been pivotal for the Clarets up front, but if they are to stay up, ensuring they are difficult to break down is vital.
Nick Pope has continued to show his importance between the sticks, and Sean Dyche's faith in the shot-stopper became all the more apparent when he allowed Tom Heaton to leave for Villa.
The idea of relying on Joe Hart for the second half of the season would certainly make James Tarkowski and Ben Mee nervous…
Chelsea – N'Golo Kante
Tammy Abraham for goals, Mason Mount for the future… all fair shouts for a team looking forward under Frank Lampard.
But there is no denying Kante is still the man who makes the team tick. Until his legs give way, Chelsea will have to keep running him into the ground for the sake of the side.
Crystal Palace – Wilfried Zaha
While he has had a quiet campaign and continues to push to quit Selhurst Park, Zaha is the only player Palace and Roy Hodgson can turn to for a sudden speck of stardust.
A crucial contribution or a stunning strike is always in the back pocket of the Eagles forward, and they would be bang in trouble if Zaha finally forces his way out before the summer.
Everton – Richarlison
Many of the Goodison Park faithful will be itching to scream 'none of them' in reply to this.
Seamus Coleman would provide the sentimental option in one player whose commitment cannot be questioned from down the years and moving forward under Carlo Ancelotti.
But star quality is the key in the modern game – and Brazilian Richarlison holds the cards for how Everton can pull themselves out of the mess they find themselves in.
Leicester – Jamie Vardy
Similar to Aubameyang at Arsenal, Leicester simply could not live without Vardy's goals.
The 32-year-old has 17 goals in all competitions this season and leads the way in the Premier League standings, having been crucial to the Foxes' charge in second spot.
Arsenal must be kicking themselves they failed to lure Vardy to the Emirates in the summer of 2016 – nearly four years on and he's basically priceless.
Liverpool – Virgil van Dijk
Jurgen Klopp would insist no player in his starting XI is dispensable in the transfer market, and he would have a case for the likes of Sadio Mane, Mohamed Salah, Andy Robertson, Trent Alexander-Arnold and Alisson.
But one player – the runner-up for the 2019 Ballon d'Or – who has made the clearest difference to Liverpool's team in recent times.
Van Dijk has turned the Reds from vulnerable to invincible. The centre-half is the world's best in his position. He would certainly leave the biggest whole in the European champions' team.
Manchester City – Aymeric Laporte
To emphasise the point of Van Dijk's being Liverpool's indispensable star, Laporte's absence through injury this season has been the biggest blow Pep Guardiola could have had.
City have simply not been in the title race with Liverpool this term, and their troubles at the back without Laporte have been obvious for all to see.
Kevin De Bruyne, Raheem Sterling, David Silva and Sergio Aguero are among their world-class options to pick from too, but Laporte has been evidently carrying City at the back for too long already.
Manchester United – Marcus Rashford
Ole Gunnar Solskjaer is more focused on bringing players in than losing key individuals this month – although speculation always surrounds Paul Pogba at Old Trafford.
But one player in the current team whose departure would simply send fans into meltdown would be Rashford.
The 22-year-old academy product and England striker is United's symbol of hope for the future – if he were to go, the relationship between fans and players would reach a new low.
Newcastle – Martin Dubravka
Steve Bruce's side have defied the odds to give the Premier League a real go this season, having begun the campaign as relegation contenders.
Newcastle sit 13th and would have lost a lot more than 10 games this term if it weren't for goalkeeper Dubravka.
He put pen to paper on a new six-year deal in October, highlighting just how highly he is valued at St James' Park.
Norwich – Teemu Pukki
Goals keep you in the Premier League, and Finland hitman Pukki is a born finisher.
While Todd Cantwell and Max Aarons have taken to the top flight like ducks to water this term, Pukki's stats in front of goal in a struggling side cannot be overlooked.
Sheffield United – John Lundstram
The Blades are arguably the toughest club to narrow this down for, as Chris Wilder's are the definition of a team which works for each other.
There are few players who have truly stood head and shoulders above their colleagues in Sheffield United's team this term as they all work equally hard in their 3-5-2 system, which has proved tougher than any to break down.
John Lundstram has been the most popular surprise package in the side, especially among Fantasy Football fans, for his contributions all over the park, and he optimises the Blades' heart and desire to not only stay up but cause a stir too.
Southampton – Danny Ings
An easy pick and a player who has proven it is possible to come back stronger after long-term injury problems.
Ings is in the form of his life this season, having scored 15 times in all competitions for the Saints – the next closest is James Ward-Prowse with four.
Southampton would be dead and buried in the Premier League if it weren't for Ings' contributions. A slam dunker. They simply cannot replace him or afford to lose the former Liverpool and Burnley man.
Tottenham – Harry Kane
A carbon copy of Ings at the other end of the Premier League – where would Spurs be if they didn't have Kane over the past five years?
The Tottenham striker's commitment to the club, despite their lack of silverware, is potentially his most admirable quality.
His injury last week will be the worst news Jose Mourinho could have had so soon after taking charge, especially as Spurs hardly have a back-up plan to Kane.
Watford – Ben Foster
No goalkeeper has been more tested in the top flight this term than Foster at Vicarage Road.
The Hornets' horror first half to the season was tough for fans to endure, but their goalkeeper continued to put in a shift with some worldie saves along the way.
The 36-year-old club legend is now getting his reward with Watford climbing back towards safety now under Nigel Pearson, having won three of their last four in the league. But losing Foster would literally see all that hard work go to waste.
West Ham – Declan Rice
One of the toughest calls of all. Declan Rice, Mark Noble and even Lukas Fabianski have all shown this season on and off the pitch how integral they are to the West Ham team.
While Noble has done for years, Rice's influence just continues to grow, and Fabianski's spell out through injury highlighted how weak West Ham's back-up was in Roberto along with exactly why the Polish No.1 won Hammer of the Year last season.
Noble is Mr West Ham. But Rice in terms of his link to the fans, his transfer value, his importance for the future and what flogging him would mean for the supporters' relationship with the owners means he takes the honour.
Wolves – Raul Jimenez
The final contender comes at Molineux and Jimenez's adaptation to the Premier League from Portuguese football has been mesmerising.
Jimenez has had a slightly quieter season than last by all accounts yet still managed 11 goals and eight assists for Wolves in all competitions, leading their scoring charts.
He rarely seems to run out of steam, even with Europa League football to contend with this term. His importance to the team becomes more and more apparent by each game.
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