Aston Villa skipper Stiliyan Petrov and 12-goal leading scorer Gabriel Agbonlahor are major fitness worries ahead of Sunday's FA Cup fifth-round clash at Crystal Palace.
Petrov and Agbonlahor suffered ankle and leg injuries respectively during the midweek home Barclays Premier League draw with Manchester United and are regarded as "doubtful" by Villa boss Martin O'Neill.
Striker Emile Heskey (groin) and left-back Stephen Warnock (shin) have been able to resume running with no ill-effects but O'Neill will make a late check on whether they can feature against Neil Warnock's side.
O'Neill has indicated he will again make changes for the competition and the likes of Brad Guzan, Nathan Delfouneso, Steve Sidwell, Curtis Davies and Habib Beye could come into the equation to start.
Provisional squad: Friedel, Guzan, Cuellar, Beye, Collins, Dunne, Davies, Warnock, Luke Young, Ashley Young, Milner, Petrov, Downing, Delph, Sidwell, Salifou, Carew, Heskey, Agbonlahor, Delfouneso.