Peterborough United have put Aaron McLean on the transfer list after the striker asked to leave London Road.
McLean scored 33 goals in all competitions last season and was a key figure in Peterborough securing promotion to League One.
His form has attracted interest from Wolves, with the Championship club already having two bids rejected.
A £5million valuation had been placed on McLean, with Posh chairman Darragh MacAnthony confirming the 25-year-old will not be sold unless the club's demands are met.
"I offered Aaron the most lucrative contract in the history of Peterborough United Football Club and Aaron has responded by putting in a transfer request this morning," MacAnthony told the club's official website.
"We have therefore reluctantly placed Aaron McLean on the transfer list and as stated before, any interested parties will have to pay the club £3million up front plus various add-ons and a sell-on clause for the transfer of his registration.
"As far as I am concerned, if we do not get the asking price then Aaron will work out the remainder of his Peterborough United contract until 2011."
Meanwhile, Peterborough boss Darren Ferguson has officially retired from playing after not featuring for the first team last season.
Ferguson said: "I won't be playing any more that is for sure, but I'm certainly taking part in all of the pre-season training with the squad."