Ander Herrera said Manchester United's offer of a new contract came too late following his arrival at Paris Saint-Germain.
Herrera has joined PSG on a free transfer and signed a five-year deal with the club, having made up his mind to join them before United made him an offer of their own.
Per Marca's Alberto Rubio (h/t Goal's James Westwood), he said:
"I don't like looking at the past, but there were differences regarding the project and my importance within it. I was very happy, I have a lot to thank the club for, the fans and also [manager Ole Gunnar] Solskjaer.