The Black Cats are not in League One action until April.
The Black Cats ace is likely to be out for the remainder of the League One season.
Sunderland grabbed a 1-1 draw at League One rivals Wycombe Wanderers on Saturday thanks to a stoppage-time Duncan Watmore equaliser.
Duncan Watmore played well for Sunderland against Blackpool on Tuesday.
The Black Cats forward has endured two years of injury woes but is now back on the pitch.
Sunderland drew at home with Blackpool on Tuesday night.
The Black Cats ace scored against Man City's Under-21s in the Checkatrade Trophy. His last goal before then was in a Premier League win.
Watmore managed 45 minutes for Sunderland in the Checkatrade Trophy.
Sunderland drew with against Charlton Athletic on Saturday.
Sunderland winger Duncan Watmore has now made four appearances so far this season.
Newcastle United boss Steve Bruce has quickly strengthened his attack since taking charge at St. James' Park.
Tottenham Hotspur boss Mauricio Pochettino is known to be a big fan of Juventus forward Paulo Dybala.
Tottenham Hotspur have previously been linked with the Crystal Palace winger, who now wants a move to White Hart Lane.
Everton are said to be interested in Moise Kean, as Marco Silva looks to improve his attack.
Celtic are reportedly keen to sign Basel defender Silvan Widmer.
Leeds United sold Pontus Jansson to Brentford earlier this summer, in one of the most surprising transfer moves of the window so far.
Everton boss Marco Silva is said to be keen on both Wilfried Zaha and Moise Kean.
Tottenham Hotspur reportedly 'consider' a move for the Lyon star.
Liverpool recently secured the services of highly-rated Fulham youngster Harvey Elliott.
Tottenham Hotspur were beaten by Liverpool in the Champions League final in their last competitive match.
Sunderland are currently heavily reliant on youngster Josh Maja to score goals in League One.
The Black Cats man sustained two serious injuries in Sunderland's two relegation campaigns, but is edging ever closer to full fitness.
Sunderland manager David Moyes addressed the media ahead of his side's trip to Swansea City in the Premier League.