Magilton has no other worries with Jon Walters expected to play despite having an ongoing knee problem.
Town's initial 20 man squad: Bruce, Bywater, Casement, Colgan, Counago, De Vos, Garvan, Harding, Haynes, Lee, Miller, Naylor, Norris, Quinn, Sito, Sumulikoski, Trotter, Walters, Williams and Wright.
Kevin Blackwell will give late fitness tests to two of his players before the match.
Blackwell, who refused to reveal the identity of the injured duo, will be without on-loan Manchester United winger Lee Martin, who has a knee ligament injury, and the suspended Stephen Quinn.
Quinn will sit out the first of a three-game ban following his last-minute dismissal against Charlton.
Blackwell revealed he was ready to make changes at Bramall Lane after Saturday's 2-0 defeat and could be tempted to switch his strikers.
James Beattie and Billy Sharp could make way for second-half replacements Rob Hulse and Jon Stead in the starting line-up, while David Carney and Keith Gillespie will both be hoping to return to the starting line-up.