Liverpool boss Rafa Benitez is baffled by Manchester United's stance over Gabriel Heinze's proposed move to Anfield.
Benitez has offered £6.8million for the Argentina international - the fee which would secure the Heinze's release, stated in a letter from United to the player's agent.
However, United boss Sir Alex Ferguson insists he will not sell Heinze to Liverpool, leaving Benitez to say: "I don't know what the problem is.
"I know what they said to the press but everyone knows they signed a document."
Ferguson has earlier said: "Heinze is not going to Liverpool as far as I'm concerned.
"We are examining some of the statements coming from his agent and when the contact was first made, but at the moment we have nothing more to say.
"We are not happy with the agent's conduct in the matter and we're examining that."
Juventus and Real Madrid are also being linked with Heinze who has made 83 appearances for United during his three seasons at Old Trafford.