West Ham United have refused to allow Carlos Tevez to have a medical at Manchester United on Wednesday as arguments about the Argentina international's future continue.
United are keen to sign the 23-year-old for a reported £30million fee, but there is some confusion as the Hammers insist all dealings should be done with them and not Kia Joorabchian of MSI who owns Tevez's economic rights.
West Ham released a statement saying: "No agreement has been reached in relation to Carlos Tevez."
Under Premier League rules, one club is not allowed to give a player a medical unless his current club agrees.
United chief executive David Gill said on Monday that the proposed transfer had become "over-complicated".
The Premier League has insisted West Ham, who hold Tevez's registration, must receive the majority of the fee rather than Joorabchian.
Last week, a Premier League spokesman said: "Any deal for Carlos Tevez has to be done directly with West Ham United.
"They hold the registration and we will not transfer the registration unless a deal is done directly with the club."