Sunderland have been rocked after scans revealed Duncan Watmore has suffered a cruciate knee ligament injury.
The forward will now almost certainly miss the rest of the season, a huge blow to Sunderland and manager David Moyes.
Watmore has been a regular under Moyes this season and has linked up well with Victor Anichebe and Jermain Defoe in the club's recent run of three wins in four Premier League games.
The England Under-21 international injured his knee in the 83rd minute of the 2-1 win over Leicester City at the Stadium of Light and left the field on a stretcher.
Watmore underwent a series of scans and the results have revealed cruciate knee ligament damage.
His is the latest in a long line of injuries for Sunderland this season.
Watmore, who was enjoying one of his best games of the season, was carried off following a challenge by Foxes’ defender Christian Fuchs
Speaking after the game, Moyes said: "The team is getting better but, unfortunately, we’ve picked up another injury with Duncan. It doesn’t look great.
"Duncan has been playing well."
Watmore’s injury follows long-term injuries to Paddy McNair and Lynden Gooch, while Lee Cattermole is also out for up to four months with a hip injury.
There was slightly better news on Gooch, who travelled to London on Friday to consult a specialist over his ankle injury, after it was confirmed he doesn’t need an operation.
Gooch, though, is still expected to be out for up to three months.