Sunderland's defence has been a big problem so far this season, with the Black Cats leaking 23 goals already this term.
Comical errors from goalkeeper Vito Mannone cost him his place in the team to Costel Pantilimon, whilst experienced duo John O'Shea and Wes Brown have also struggled at times.
With loan signing Sebastian Coates making little impact since arriving from Liverpool, manager Gus Poyet is expected to bring in a new centre back in January.
Palermo's Ezequiel Munoz has been linked, but summer target Virgil van Dijk is more likely to join Arsenal, Tottenham or West Ham having continued his great form with Celtic.
Now though, it's Hull City's Curtis Davies who is being linked with a £6m move to the Stadium of Light having fallen behind James Chester and Michael Dawson in the pecking order under ex-Sunderland boss Steve Bruce at Hull.
The 29-year-old, who has also been linked with Leicester City, was tipped for England recognition last season, and Sunderland could land themselves a bargain in Davies is Hull do decide to let him go.
One thing to consider though, is that Poyet has tried to play down January activity, suggesting that it's difficult to complete deals in the middle of the season.
"I think it depends. January is difficult," said Poyet. "There needs to be a lot of things coming together. It’s difficult for everything really."