Gannon may be tempted to name an unchanged side regardless, with Sergio Torres in with a chance of making his first start at home since March 2009 after being recalled at Vicarage Road.
Centre-half Ryan Bennett remains on the sidelines as he recovers from an ankle injury and on-loan Arsenal full-back Kerrea Gilbert is also out with a knock sustained in training.
Posh have won their last two games but remain eight points adrift of safety.
Source: Team Talk
Source: Team Talk