"It's not the calf he injured in pre-season but he said he felt something go 'pop' so that doesn't sound too good," said Millers boss Ronnie Moore to the Star.
The unlucky defender is set for another spell out of the side having regained his place due to captain Ryan Cresswell's compassionate leave. Cresswell could figure in tomorrow's reserve game with Derby at Don Valley (7pm), as well as several other first teamers.
The skipper is set for a return to first team action at Accrington this coming weekend following his grandad's death.