Aston Villa midfielder Boubacar Kamara will miss the rest of the season with a knee injury, says manager Unai Emery.
The 24-year-old tore his anterior cruciate ligament (ACL) in Sunday's 2-1 defeat by Manchester United in the Premier League.
Villa forward Emiliano Buendia and defender Tyrone Mings are also sidelined with ACL problems.
"When they are injured for a long time, it's the worst in football," said Emery.
"It's more difficult for the player, as a person, when they are injured.
"We've had two injuries for a long time, for all the season, with Buendia and Mings.