Sunderland's Diarra sidelined until December after surgery

The 21-year-old sustained the problem during training ahead of Sunday's 1-1 draw with Aston Villa, forcing him to miss the fixture.

Diarra underwent surgery on Monday, with Sunderland confirming that the procedure was successful.

The club now expect him to be sidelined for several months as he recovers fully from the injury.

The setback is a blow for Sunderland, who had been relying on the player's energy and creativity in midfield. Fans will hope the young midfielder returns to action fit and ready to make an impact in the second half of the season.