Barnsley midfielder Hugo Colace is expected to return to the squad for the home game with Reading.
Argentinian Colace has been sidelined since early February due to a strained back muscle and has missed the last seven matches.
But manager Mark Robins must hand late fitness tests to three players, with defenders Paul McShane and Jason Shackell both nursing hamstring strains sustained in last week's draw at Cardiff and midfielder Jacob Mellis, on loan from Chelsea, nursing a similar problem.
Robins must decide whether to recall striker Andy Gray, who scored twice after replacing Danny Haynes against Cardiff.
Haynes is expected to shake off the leg injury that forced him off, but Gray is expected to start up front alongside Marlon Harewood, on loan from Blackpool, after the pair impressed Robins last week.
Defender Luke Potter is a long-term absentee due to medial knee ligament damage.