The Glovers are five points off the automatic promotion places and they will have their captain available for their remaining four games, although he will not be rushed straight back into the starting XI.
McAllister has not featured since the defeat to Swindon last month as he recovered from a foot injury and served a two-match suspension.
Midfielder Dominic Blizzard is also set for a return after overcoming the hamstring problem that saw him sidelined for three games.
And Gary Johnson has received a further boost with on-loan forward Jordan Cook returning to the club after receiving treatment on a knee injury at parent club Charlton.
Yeovil have lost one of their last eight games and need six points from their remaining games to mathematically secure a play-off spot.