With injuries decimating Arsene Wenger's defensive options, the Frenchman is understandably keen to bring in reinforcements to strengthen the back line.
Eric Adibal could be the perfect signing, with the versatile Barcelona defender considering his options with 6 months left on his contract at the Camp Nou.
Long term target Salomon Kalou is also an option for Arsene Wenfer, with Chelsea willing to sell now rather than lose him for free in the summer.
Chelsea are close for tying up a deal for Bolton defender Gary Cahill, but Andre Villas-Boas has hinted he wants at least one more signing.
The Portuguese manager is targeting Marseille defender Cesar Azpilicueta, while Juventus Milos Krasic could arrive on loan to bolster the midfield.
With Liverpool currently 6th in the Barclays Premier League, Kenny Dalglish is looking at one or two players to help the Reds break into the top four.
With Liverpool lacking a clinical edge and quality in wide areas, Dalglish is keen on Blackburn winger Junior Hoillet and Arsenal target Salomon Kalou.
Roberto Mancini has bemoaned a supposed lack of depth in his expensively assembled squad recently, but has been told he must sell before he can buy.
Daniele De Rossi is a priority, but looks set remain at Roma. Chiek Tiote is another option, but Newcastle would be loathe to let him leave.
Sir Alex Ferguson has insisted he will not be making any signings in January, but speculation surrounding Wesley Sneijder refuses to go away.
In reality, a move looks more likely to happen in the summer, after Paul Scholes made a surprise return to Old Trafford.
Spurs have made some astute signings in recent transfer windows, thanks to notorious (but don't let him hear you say it) wheeler dealer Harry Redknapp.
Junior Hoillet and Christopher Samba are both quality targets who would represent the value for money that Redknapp and the club are looking for.
The Tottenham manager has also confirmed his interest in Marseille striker Loic Remy, but would need to stump up £22m in order to seal the deal.