Rossoneri Vice-President Adriano Galliani confirmed on Tuesday evening that they had agreed personal terms with Tevez and agent Kia Joorabchian, then sent an official proposal to the Eastlands club.
"At the moment there are no developments," FIFA agent and Joorabchian's collaborator Giuseppe Riso told direttanews.it.
"It remains difficult to strike a deal with Manchester City, so this is a complicated transfer.
"Will it be sealed within hours? No, we are only at the beginning. There are many things still to be done.
"There is no agreement with City and the issues regarding the player also have to be deepened. We'll resume talks in the next few days."