With Sunderland struggling at the wrong end of the Premier League table, January recruits are a must if they are to maintain their top flight status.
But in order to sign a centre-back and a centre-forward, Sam Allardyce may also have to move on some of his existing squad.
Who could be facing the axe? We look at five players that could leave the Stadium of Light:
The Dutch international made no secret of the role Dick Advocaat played in bringing him to Wearside in a £7.98 million summer move from Dynamo Kiev.
Since then, Advocaat has resigned, and Lens has found himself firmly out of the picture under Sam Allardyce.
Talent in abundance but perhaps not the workrate to go with it.
Recently disciplined and forced to train with the Under-21s, he is back in the matchday squad now but his days on Wearside could be coming to an end.
If Sunderland could recoup their investment, Lens could be the first out of the door.
The forward has found himself very much on the fringes of the first team this season, having to make do with a regular spot on the bench.
He is hardworking and committed and has performed well for the Under-21 side.
But Allardyce could look to cash in on Graham to help fund an overhaul of the squad.
For the first team, he has only made two starts this season.
Out of contract in the summer, while earning around £40,000 per week, it may be Sunderland cash in on Graham in January, with a lot of reported interest from Championship clubs.
The club's No 2 stopper is not content with sitting on the bench every week, playing second fiddle to Costel Pantilimon.
He could be set for a January exit, with Jordan Pickford recalled from his impressive loan spell at Preston North End.
Back-up keeper Mannone has been limited to a solitary appearance in the League Cup this season.
Verona are rumoured to have made an enquiry for Mannone, who was the subject of speculation during the summer, and has another 18-months left to run on his Sunderland contract.
Hailed as one of the countries brightest talents when he broke into the Everton first-team, Rodwell’s career has went alarmingly downhill since joining Manchester City for £10.5 million in 2012.
A move to Wearside in 2014 was designed to get the Southport-born midfielder’s career back on track, but he has failed to cement a starting place in a struggling Sunderland side.
Rodwell’s under contract until 2019, with a lucrative wage packet.
For a player who isn’t a regular starter, it may be that Allardyce could be tempted to move him on to fund a big January move.
The £2million summer signing from Celtic has been far from a success.
Sunderland are stretched defensively but have DeAndre Yedlin and Billy Jones as cover at right-back, therefore Matthews is one player Allardyce could look to move on.
The 23-year-old has struggled with injuries too and is currently out with pulled ankle ligaments.
Matthews signed a four-year deal in the summer after completing his move from the Scottish giants.
He has only made one sub appearance in the Premier League and a League Cup start since signing for Sunderland.