Sunderland are thought to be keen on adding to their attacking ranks this January.
Jack Ross is believed to want to add a forward to his side as the Black Cats look to bolster their squad as they continue their challenge to win promotion from League One.
And, it appears he has identified one man that could help the club play Championship football next season.
The 28-year-old was recently on loan with Kilmarnock and hit eight goals in his 16 appearances for the Scottish Premiership club, leaving Aberdeen interested.
However, Sunderland are now thought to be in the race with Birmingham looking to recoup some of the £400,000 they splashed out on him in 2016 to sign him from Dundee.
Ross is believed to have the financial power to make an offer for Stewart, whilst also being able to offer the player a lucrative wage.
Stewart impressed during his time in the Scottish Premiership earlier this season and could be considered an excellent coup for Sunderland if they manage to sign him.
The forward, who can also play out wide, would certainly help to add firepower to their squad and boost their chances in gaining promotion back to the Championship.
However, with interest from Aberdeen as well, the Black Cats could have a battle on their hands to convince him to drop down to League One.
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