Blades wait on duo
Sheffield United will assess Harry Maguire and Chris Porter ahead of their midweek clash with Peterborough.
Maguire (knee) and Porter (hamstring) both limped out of Sunday's FA Cup draw with Fulham and face a race against time to be fit.
Blades captain Michael Doyle will definitely miss out as he begins a three-match ban for his red card against the Cottagers.
Billy Paynter, Elliott Whitehouse and Callum McFadzean will be available to boss Nigel Clough after they were ineligible for the cup tie.
Peterborough will be without Lee Tomlin as they aim to get back on track at Bramall Lane.
The forward was sent off for the third time this season in Saturday's 5-4 defeat by Oldham and starts a three-game suspension.
That result, which came after Posh had stormed into a 3-0 lead, increased the pressure on boss Darren Ferguson, who may decide to ring the changes.
Striker Conor Washington is set to make his debut for the club after joining from Newport, while Rob Olejnik could take the gloves off Joe Day after he conceded eight goals in the last two games.