Moore is assessing the fitness of defenders Nick Fenton and Dale Tonge, who both picked up knocks during the 4-0 win against Stockport on Saturday.
Midfielder Jason Taylor is missing again as he serves the final game of a three-match ban.
Port Vale are without on-loan striker Tom Pope, as he is ineligible to face the Millers after leaving last Friday for a month.
Vale will have midfielder Doug Loft back in the squad though, as he has now fully recovered from a calf injury.
Source: BBC Sport