Tilley staged a dramatic intervention when he came off the bench to snatch a last-minute winner in the midweek victory over Mansfield.
Josh Wright also impressed coming off the bench and could feature, but defender Tom Dallason is set to remain sidelined with a foot injury.
Pressure continues to mount on Walsall boss Brian Dutton in the wake of their defeat to fellow strugglers Barrow on Friday.
The Saddlers have now won just one of their last 14 games and their problems worsened with an injury to centre-back Dan Scarr.
Scarr is set to miss the trip to Crawley but full-back Cameron Norman made an appearance off the bench following a foot injury, and could start.