Peterborough boss Darren Ferguson insists Norwich need to increase their bid for Craig Mackail-Smith if the high-flying Championship club are to meet their valuation of the star striker.
Posh had turned down a bid from the Canaries on Tuesday before the prolific frontman set United on their way to a 4-1 victory over Sheffield Wednesday with his 27th goal of the season in all competitions.
Ferguson said: "They (Norwich) need to make an improved bid for Mackail-Smith as their offer was nowhere near good enough."
He added: "They want to get into the Premier League which is worth an awful lot of money, and if they want to be serious about it they need to make us a decent offer.
"He will only go if it suits this football club. I've spoken to the chairman about it and he agrees with me.
"Craig is a very important player for us and has been for some time and I certainly don't want to lose him now while we are so well placed ourselves."
After Mackail-Smith's opener, Lee Tomlin doubled the visitors' advantage with a delightful chip over keeper Nicky Weaver before George Boyd slammed in a third just before half-time.
Substitute Paul Heffernan briefly gave Wednesday hope with a reply soon after the restart, but those thoughts were killed off when Weaver spilled a soft shot from Boyd into his own net to seal another good night for Posh.
Wednesday boss Gary Megson revealed he had a blazing row with his players at half-time after watching them concede three "easy" goals in the opening 45 minutes.
"A few home truths were said but I shouldn't have to do that before anybody's done anything wrong to get a reaction from them," he said. "I said to the players I don't normally like telling people what goes off, but there was an almighty bust-up at half-time because it's just not acceptable."
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