Striker Howard and midfielder Walton began Saturday's defeat at Rochdale on the substitutes' bench - the former went on for the last 20 minutes - but manager Colin Cooper has hinted at "a couple of changes".
Cooper, who has no new injury or suspension worries, could also hand starts to strikers Luke James and James Poole, while teenage midfielder Jordan Richards and goalkeeper Andy Rafferty will also be hoping to feature.
Forward Zak boagey missed the opening-day defeat due to a groin strain and could be included in Cooper's squad
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- Colin Cooper