Captain John McGinn could be out for up to two months in a further injury blow to Aston Villa.
The midfielder was forced off early in last week's defeat by Everton with a knee injury.
It means the Scotland international could miss up to nine games as third-placed Villa try to maintain their Premier League title push and Europe League hopes.
"Normally, he is going to be out for some weeks, maybe even one or two months. But I want to wait for the doctor's opinion on it," boss Unai Emery said.