Milner was rested for the 1-0 win at Bolton last weekend after suffering from a sore Achilles but has resumed training and is expected to play at Wembley if he suffers no reaction.
Dunne has been nursed through recent weeks with a similar injury and pulled out of training on Thursday, but O'Neill is optimistic he should be available.
Villa (from): Friedel, Guzan, Cuellar, Luke Young, Beye, Dunne, Collins, Davies, Warnock, Downing, Milner, Petrov, Sidwell, Delph, Ashley Young, Carew, Agbonlahor, Heskey, Delfouneso, Albrighton, Clark.
