With days to go until the January transfer window, we look at four clubs who could change their season with one signing.
Manchester United - Paulo Dybala
Manchester United began the season lacking coherence on the pitch, but now, they look like a well-oiled machine.
But while United's form has put them in prime contention for the Premier League title, they need to take advantage of the January transfer window before it draws to a close, in a bid to bolster their squad and, in turn, improve their chances of maintaining their current form.
One player, who United could sign to cement their place at the top of the table is Juventus' Paulo Dybala.
With Odion Ighalo leaving the club, Ole Gunnar Solskjaer needs a player who can come in and make an instant impact in United's attacking third - and Dybala is one player who can do just that.
Manchester City - Memphis Depay
Sergio Aguero has been restricted to just five Premier League appearances for City this season due to injury problems.
Gabriel Jesus has also endured a spell on the sidelines this term - because of this, Manchester City have lacked a real focal point in the attacking third, with Pep Guardiola having to rely on the likes of Ferran Torres and Bernardo Silva to lead City's line.
So far, City have managed to do pretty well without Aguero and Gabriel Jesus up front - so much so, that they're second on the league table and boast a game in hand while being two points behind Manchester United who sit in first place.
But considering there are still four months left before the league draws to a close, City can't afford to place their faith in Aguero and Gabriel Jesus. Outside of his injury concerns, Aguero is yet to register his first Premier League goal of the season and Gabriel Jesus has only scored two in 10 appearances.
On that note, City would do well to acquire the services of a new striker this summer, and one player they could sign to lead the line is Olympique Lyon's Memphis Depay.
The former Manchester United man has scored 12 goals and registered 6 assists in 12 starts for Lyon this season.
He'd be an excellent addition to City's set-up, considering he has the potential to transform City's attack in its current state.
Leicester City - Christian Eriksen
But in order to successfully do so, they need to bolster their ranks going into the final four months of the season and one player who could come into the team to do that is Christian Eriksen.
For the better part of the past decade, Eriksen was one of the most consistent midfielders in the Premier League.
He regularly mustered moments of magic for his former side, Tottenham, similar to the way Bruno Fernandes is performing for Manchester United these days.
The Denmark international has struggled to find his form at Inter Milan, hence he's reportedly keen on returning to the Premier League - and considering Leicester's current ambitions, the Foxes could be a great destination for Eriksen.
Eriksen boasts incredible speed of thought. He may not be the quickest player on the pitch, but he's able to operate faster than most players thanks to his ability to think quickly.
He's also an incredible asset in set-piece situations, as he's able to whip in dangerous balls from corner kicks and convert free-kicks into goals.
The Dane could help bolster Leicester's chances of winning the league, but it remains to be seen if the Foxes will make a move for him.
Liverpool - Ozan Kabak
With Joe Gomez and Virgil Van Dijk currently sidelined until the end of the season, Liverpool is in dire need of at least one new centre-back to act as a stopgap up until the end of the season.
Jurgen Klopp has had to rely on the likes of Jordan Henderson, Fabinho, Rhys Williams and Nathaniel Philipps to man Liverpool's backline ever since Gomez and Van Dijk picked up their injuries.
While the trio haven't performed badly, utilising them up until the end of the season will not be sustainable.
A large part of Liverpool's success last season was due to the strength of their backline.
With a weaker defensive set-up, Liverpool may struggle to keep up with the likes of United, City and Leicester, on that note, Klopp needs to sign at least one new centre-back before the January transfer window shuts - and a great candidate for that role would be Schalke 04's Ozan Kabak.
Kabak has built a reputation as one of the most consistent centre-backs in the Bundesliga. He's not Liverpool's preferred option, Kalidou Koulibaly, but he'd be an amazing player for Liverpool to have within their ranks up until the end of the season.
Standing at 6'1 and boasting incredible athleticism, Skriniar, is great at winning aerial duels.
He currently averages a 4.2 aerial duel win rate, which is nearly double Van Dijk's win rate (2.3).