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Penney faces a selection headache ahead of Saturday's game with Darren Ferguson's Posh side following yet another setback for Polish striker Pawel Abbott.
"The most we wanted to play Pawel Abbott against Dagenham was for 45 minutes to an hour, we certainly didn't have 15 minutes in the equation," he said.
"Julian Joachim is back next week, so we'll have to make some big decisions about who we send out at Peterborough."