TONY Mowbray has played down any concerns that Ross Stewart could leave Sunderland this month, and says talks over an extension to his contract are ongoing.

Stewart's current deal expires at the end of this season but Sunderland have the option to extend it by a year, effectively meaning he has 18 months to run on his contract on Wearside.

But amid the uncertainty as to whether Sunderland can agree a new longer-term deal with the striker, a number of clubs are circling. Sunderland's Championship rivals Middlesbrough are keen on Stewart as Michael Carrick's side prioritise the signing of a striker in the January window, while several other Championship clubs are also showing an interest.

Brentford, Crystal Palace and Rangers are also said to be monitoring the situation of Stewart, who made it four goals in four games since his return from injury with his equaliser in Sunderland's 1-1 draw at Blackpool on New Year's Day.

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Everton's decision to recall Ellis Simms from his loan spell at the Stadium of Light has made it even more important for the Black Cats to keep hold of Stewart, but Mowbray remains calm and insists Sunderland's only intention this month is to continue in their efforts to get the striker to sign a new long-term deal.

Mowbray said: "Ross has 18 months left on his deal. There's nothing to be said really.

"He knows he's at a football club with a huge support base, huge potential and some really talented players that are creating chances for him. He's scoring goals.

"I don't think Ross is in any rush to do anything. I'm pretty sure the club are in no rush to do anything other than to entice him to sign a new contract and those conversations I'm sure are ongoing."

After Simms' Everton return, Mowbray revealed Sunderland have "accelerated" their January transfer plans and are in talks with a striker who they hope to sign on a permanent deal. Mowbray also hinted that Sunderland will again look to the loan market this month, having enjoyed success with the signings of Amad Diallo and Simms in the summer.