Houllier said: "Me and Phil (Thompson) are not happy with the tackle on Emile who took a bad kick on the side of his shin. Unfortunately, it is the same place he got a kick playing for England in midweek."
Czech star Milan Baros, who took Heskey's place alongside Michael Owen for the final 30 minutes at Villa Park, stands by to replace his striking colleague if the former Leicester fails to respond positively to treatment at Melwood this Wednesday.