Midfielder McCormack, who has been playing at right-back recently, suffered a rib injury during last weekend's 1-0 win over Notts County.
If McCormack is ruled out Shaleum Logan will be in line for his first start in nearly two months.
Boss Uwe Rosler has no other injury concerns and could recall on-loan Fulham striker Marcello Trotta, after he was rested against County, and Chelsea loanee George Saville who came on as a second-half sub.
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- Shaleum Logan