Sunderland have been rocked by news that defender Jason Denayer has picked up an injury on international duty.
Reports in Belgium say the centre-half could be out for between two and four weeks after tearing an adductor muscle.
The 21-year-old picked up the problem playing for Belgium's Under-21 side in Montenegro last Friday, coming off after just 33 minutes of the Under-21 European Championship qualifier.
Denayer has played in three out of the last four Premier League games for Sunderland, and his injury is another blow for beleaguered boss David Moyes.
The on-loan Manchester City defender has been used in both full-back positions and joins an increasingly lengthy injury list at the Stadium of Light, with Jan Kirchhoff, Adnan Januzaj, Lee Cattermole, Sebastian Larsson, Steven Pienaar, Vito Mannone and Fabio Borini all on the sidelines in recent weeks.