The experienced centre-back has been ruled out for the Christmas period with an ankle injury which kept him out of their impressive 2-0 win over Fleetwood on Saturday.
It means Connor Goldson looks likely to retain his place having made his first start last weekend since signing on loan from Shrewsbury.
Mark Yates' squad, who will be given Christmas Day off in the build-up to kick-off, will include young midfielder Kemar Roofe after the West Brom loanee returned to training with his Robins team-mates on Monday.
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- Connor Goldson