The 19-goal striker hobbled off in the eighth minute of Saturday's 2-1 win over Fleetwood with a foot injury sustained while giving the Millers the lead two minutes earlier.
Boss Steve Evans has rated his chances at 50/50 and insists he will not risk the former Manchester United man unless he is fully fit in a game that could see the Millers move into the top three with a win.
Daniel Kearns has missed the last three games with an Achilles injury but he is now back in contention, although he is unlikely to start given the form of widemen Ben Pringle and Kieran Agard.
Mark Bradley (foot) is a doubt but Claude Davis is fit again after a dead leg and will hope to earn a start.
The match sees a first return to Valley Parade for Evans since he - and Davis - were involved in a mass brawl while at Crawley last season, which resulted the Millers boss receiving a six-match stadium ban earlier this campaign.