Walton was shown a straight red card in Friday's home defeat to MK Dons for his challenge on Patrick Bamford and will start a three-game ban.
Manager John Hughes could also be without fellow midfielder Ritchie Humphreys again after he missed out against the Dons due to a calf strain.
Defender Evan Horwood and midfielder Antony Sweeney are also doubtful after they both sustained hamstring strains during Friday's setback.
Teenager Jack Baldwin made a surprise return to action on Friday following knee ligament damage and played the full 90 minutes, so he too could be struggling to last a second full game in the space of four days.
Charlie Wyke, on loan from Middlesbrough, overcame a heel problem in time to start against the Dons and although fellow striker James Poole missed out due to a knock, he could return to contention to boost Hughes' attacking options following Thursday's departure of Steve Howard to Sheffield Wednesday on loan.
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- Patrick Bamford