Sunderland striker Ross Stewart faces an anxious wait to discover the extent of his Achilles injury.
Manager Tony Mowbray fears "it's a bad injury" but will await scan results.
It is the second notable injury Stewart has sustained this season after a thigh injury in September kept him out for nearly four months and 15 league games.
The former Ross County forward has scored in five of the six Championship games since his return, and has 11 goals and three assists in 15 games in total this season.
Mowbray told BBC Radio Newcastle: "First thoughts is it's pretty bad.