Red Devils boss Richie Barker will have to make two changes for this weekend's home fixture.
Crawley grabbed a shock 2-0 win at high-flying Peterborough last weekend but defender Joe Walsh drops out of the squad as he is on international duty with Wales' Under-21s and midfielder Mike Jones is suspended after he was sent off late on.
Mark Connolly should step into the back four in Walsh's absence while James Hurst could also come in at right-back, with Josh Simpson moving back into midfield in place of Jones.
New striker Emile Sinclair was an unused sub at Peterborough, having joined from Posh 48 hours earlier, so he will be hoping to make his Crawley debut.
Amine Linganzi is set to be back in contention for the Gills short trip to rivals Crawley.
The midfielder, who has not featured for four weeks, trained for the first time on Thursday since suffering a hamstring injury and then going down with a bout of tonsillitis.
Should Linganzi suffer no reaction then he will come into boss Martin Allen's plans for the encounter against Town.
However, on-loan right-back Michael Harriman is away on international duty with the Republic of Ireland's Under-21 squad and so misses out.