The on-loan striker got his studs caught in the ground towards the end of the opening 45 minutes at the County Ground and, as he went to turn, his ankle gave way.
Both he and manager Danny Wilson now face a short wait to discover the extent of the injury but Revell is hopeful it will not be too serious.
The 26-year-old Southend forward, who could join the Robins on a permanent deal in January, told the club's official website: "I'm just going for a scan to check there's no damage inside the ankle.
"I thought I could carry on but it just stiffened up a little bit at half-time and we didn't want to make it any worse so I came off.
"Hopefully I'll get the all-clear on Monday and then I'll know if there's no damage to it I can carry on training."