The Republic Of Ireland international missed his country's midweek encounter with Brazil after suffering a leg injury in the Carling Cup final setback against Manchester United.
Villa boss Martin O'Neill has no fresh major injury worries as his side aim to stop Reading adding a third Premier League scalp after their wins over Liverpool and Burnley in the competition.
Skipper Stiliyan Petrov and defender James Collins did not train on Friday but came through midweek games for Bulgaria and Wales unscathed.
Kick-off is at 1.45pm.
Villa (from): Friedel, Cuellar, Dunne, Collins, Warnock, Downing, Petrov, Milner, Ashley Young, Heskey, Agbonlahor, Luke Young, Sidwell, Carew, Delfouneso, Delph, Guzan, Collins.