Peterborough chairman Barry Fry has blamed James McClean's agent after his move from Derry collapsed.
The two clubs had agreed a fee for the winger but the deal has now broken down.
"The agent was more interested in securing his own 10 per cent than he was in looking after his client, even though FIFA rules say he's only entitled to five per cent of any deal anyway," Fry told the Evening News.
"We were offering a young player the chance to play Championship football and yet his agent seemed to think he was dealing with Manchester United not Peterborough United."
Meanwhile, Posh hope to finalise a deal to bring Wolves midfielder Nathaniel Mendez-Laing back to London Road on loan for the forthcoming season.
Fry added: "But as one door closes another one opens. I expect us to have Mendez-Laing back at the club by the end of the week."
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