Skipper Jim Magilton and central defender Jason De Vos are both doubts ahead of Wednesday's trip to Nottingham Forest. Magilton was not involved in Saturday's win against Gillingham, while De Vos had missed training earlier in the week after picking up a knock in the friendly with Osasuna.
Boss Joe Royle told the club site: "You never know with Jim but at the moment he looks doubtful for Forest.
"Jason won't be training this afternoon either but we are confident he will be OK for Wednesday."
Magilton has a slight tear in his thigh muscle and De Vos received a heavy blow to the knee in the game against the Spaniards.