Nathan Thompson (knee) and Tommy Miller (calf) both picked up their knocks in the 2-2 draw with Walsall and out doubts ahead of the Griffin Park clash.
Simon Ferry is likely to move to central midfield if Miller is ruled out, with either Luke Rooney or Raffaele De Vita coming in on the right of midfield.
Youngsters Connor Waldon and Alex Ferguson could travel after being included in the matchday squad on Saturday but Miles Storey (hamstring) and Troy Archibald-Henville (knee) remain sidelined for the third-placed Robins.
Swindon are two points ahead of the Bees ahead of the clash and just two points off the second automatic promotion spot in npower League One.
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