The Robins have a Capital One Cup third round tie with Chelsea to look forward to after disposing of QPR on Tuesday night but Smith picked up a shin injury in that memorable 2-0 victory and had to be taken off before the break.
If Smith fails to make it then the likes of Ryan Mason could come into contention but winger Tijane Reis is still out with a knee problem.
Former Newcastle striker Nile Ranger looks set to start for the Robins once more after netting for his first goal since signing for the club on a free transfer.
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