The midfielder has been sold to Olympique Marseille.
“Last season Kevin played 42 games, he's a great player, but it was a decision we all made together: club, Coach and player," Monchi told Sky Sport Italia.
The Dutch midfielder reportedly told friends and teammates that he was pushed out by the Giallorossi.
“I don't want to get into the technical, economic or tactical issues. If you are at Roma, it's because you want to be. Nobody put a gun to his head telling him to leave.
“When this situation emerged, we all decided to go forward with it."