The midfielder was sent off in Saturday's 2-1 defeat at Preston for a high challenge on Joe Garner but the Saddlers have appealed against the decision and are awaiting the verdict. Should the red card not be overturned then Mantom will start a three-match suspension against the Sky Blues.
Andy Taylor is back in training having been sidelined since mid-January with a knee injury but the Sixfields clash is likely to come too soon for his involvement, while fellow defender Dean Holden (knee) remains unavailable.
Walsall's promotion charge has been halted of late due to a five-match winless streak which has seen them lose three of their last four matches.
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- Joe Garner