Elliott has missed the Robins’ last two league matches with a calf strain and the veteran defender will not recover in time to face the Red Devils, with Keith Lowe set to deputise once more.
Otherwise, manager Mark Yates has a fully-fit and injury-free squad at his disposal.
Jeff Goulding returned to the starting line-up for the 3-1 victory at Macclesfield last time out and the striker will be hoping to keep hold of his place in the face of pressure from Jimmy Spencer and Daryl Duffy.
Midfielder Russ Penn will be looking for a starting berth, with Brian Smikle possibly giving way.
Antonio Conte called on Eden Hazard to win 'important trophies' to be considered in the same class as Barcelona's Andres Iniesta.