Caretaker manager Kevin MacDonald fears that Andreas Weimann may have suffered a serious injury in Thursday's Europa League clash against Rapid Vienna.
Aston Villa earned a 1-1 draw in the play-off first-leg clash but Austrian striker Weimann picked up an ankle injury just five minutes after coming on as a substitute.
"It's too early to say but his ankle's quite badly swollen," said MacDonald after the draw.
"We hope that it might be ligaments rather than a break. It isn't very nice for Andreas because he's one of our top prospects and it was great for him to come on here. But these things happen."
MacDonald, who picked a young side for the match with Barry Bannan giving his side an 11th-minute lead, added: "I'm very proud indeed. It was an education to come to a place like this, where it's very, very volatile.
"The intensity of the fans was tremendous from their point of view and to manage to play in patches the way they did try and play, I thought was outstanding - the young players and the senior players together.
"Sometimes it isn't just the play - it's reacting to the place that you're playing in that gives them an education.
"If you can play somewhere like here it will help them play in some of the big Premier League grounds where the atmosphere is electric as well.
"It was gratifying that we scored a goal away from home. I think some of the play early on, especially from Stephen Warnock and Stewart Downing, to then switch the play to Marc Albrighton was outstanding."