Manager Kevin Blackwell has had a potentially tough selection poser taken off of his hands after defender Matthew Kilgallon this week joined Sunderland.
Marcel Siep will therefore partner captain Chris Morgan at the back.
Strikers Darius Henderson, Jamie Ward and Henri Camara are all pushing for places in the starting line-up after Blackwell opted to partner Richard Cresswell with Ched Evans last weekend.
The Blades earned their fourth-round trip to Bolton by seeing off QPR 3-2 in a third-round replay at Loftus Road.
Source: Team Talk
Source: Team Talk