Aston Villa striker Gabriel Agbonlahor is battling to be fit for Sunday's derby clash with Wolves at Molineux.
Agbonlahor was substituted during the first half of the Carling Cup win over Blackburn because of problems with his calves.
But new manager Gerard Houllier is hoping the problem is not overly serious.
He said: "Will Agbonlahor be fit for Sunday? I don't know.
"The most reassuring thing he said was it is the two calves he felt at the same time. If it is one calf, you might think it is a possible tear but it is the two calves so probably it involves cramp or fatigue.
"Gabby said he had that during the home Europa League game with Rapid Vienna and then could play the following game."