The Republic of Ireland international joined the Lions on loan from Leicester on Thursday, prior to watching his new team-mates beat his parent club 1-0 on Good Friday evening.
Boss Kenny Jackett moved for St Ledger with fellow defenders Karleigh Osborne (hamstring) and Paul Robinson (groin) currently on the sidelines.
Jackett is also able to welcome back another defender, Mark Beevers, from suspension after he missed the last two matches for collecting 10 yellow cards this season.
Chris Taylor is a doubt with the groin strain which kept him out on Friday and fellow winger James Henry remains sidelined by a knee injury.
- Sports & Recreation
- Karleigh Osborne