The news comes from Italian journalist Tancredi Palmeri.
Palmeri told talkSPORT: “He’s signed for Manchester United.
“He signed an agreement in early June. It was sent to him at the pre-Euro 2016 training camp in Sweden, he signed it and sent it back.
“It’s the pre-agreement to prepare for the move. That’s just how things work in football, it was the same with Mourinho and Manchester United.
“As far as I know, the fee for breaking the pre-agreement is so high that nobody ever does.”