"We didn't know Memphis and Schneiderlin were going and we allowed them to go because the right offer arrived," said Mourinho.
"If players are not totally happy I don't think it is human to stop them. Only a bad offer, or no offer stops them. If the players are not happy, I won't stop them going."
On Ashley Young, who has been linked with a move to China, Mourinho added: "The first time I heard about it was when I was told it was in the media, unless Ashley Young tells me I don't take any notice. He hasn't."