The Bristol Rovers loanee, who will sign a permanent deal with the club later this week, limped off just 15 minutes into the 3-1 win over Torquay on Sunday with a hamstring injury.
Manager Paul Tisdale confirmed after the match that Gill is "very worried" about the problem which looks set to earn Matt Grimes a recall to the Exeter midfield.
David Wheeler looks set to start once more despite having three stitches on a head injury after the final whistle at Plainmoor.
- Sports & Recreation
- Bristol Rovers
- Paul Tisdale