Sunderland could reportedly lose Ross Stewart in the January transfer window, as Championship rivals Blackburn Rovers could sign the striker if they sell Ben Brereton Diaz.

The Lowdown: New contract?

Earlier this week, the Black Cats' sporting director Kristjaan Speakman revealed that the Wearside club have been engaged in ongoing talks over a new contract for the 26-year-old.

The Scotland international has one year left on his current deal at the Stadium of Light, and the club has an option of a further year.

The Latest: Blackburn prepare Stewart offer

As per The Sun, Blackburn could offer Stewart a better contract in January and will make a move if they lose Brereton Diaz.

Everton, Fulham and Leeds United all missed out on the Chilean in the summer transfer window, with the Toffees bidding £12m with add-ons which could have risen to £20m.

The Verdict: Worrying

If Rovers do bring in the money by selling Brereton Diaz, and still maintain their place near the top of the Championship table, then it will certainly be worrying for Black Cats supporters.

Hailed by Speakman as ‘incredible’ last season, Stewart finished as Sunderland's top scorer with 26 goals, helping them to fire their way to promotion from League One.

He has already netted five times and supplied three assists in the Championship this term (Transfermarkt), but if the 26-year-old does not sign a new contract soon, then Tony Mowbray's side may have no other choice but to let him go.