Juventus have reached a deal with Livorno for Croatia international Dario Knezevic, but Torino claim to have a signed agreement that he will become their player.
The defender, who suffered knee ligament damage at Euro 2008, has been the subject of a lengthy transfer battle between the Turin rivals.
Knezevic was always expected to leave Livorno following their relegation from Serie A and on Monday he arrived at Juve to finalise the terms of his transfer.
Knezevic is expected to join on a one-year loan but Juventus have the option to make the signing permanent next summer.
The 26-year-old centre-back will be officially presented as a Juventus player later on Monday after he undergoes a medical.
But Torino president Urbano Cairo has presented the Italian league with an agreement signed by Livorno counterpart Aldo Spinelli.
Cairo said: "I don't think it's possible."