Memphis Depay has asked to leave Manchester United.
United signed Depay for £25 million from PSV Eindhoven in the summer of 2015.
Depay has started just one match under Jose Mourinho this season.
"In the past couple of months, my decisions in relation to Memphis were influenced by the feelings and information that he would like to leave in January and that we were going to have a real offer that we would be willing to accept," Mourinho told a news conference.
"That obviously influences me.
"We had this conversation with a few players and we left things very, very clear. If I know, if I have the feeling that a player is leaving, I have to give chances to and develop other players.
"So then I go to [Jesse] Lingard, [Henrikh] Mkhitaryan, [Anthony] Martial, the players I know 100 percent are going to stay with us. And it is also a position where we have more options.
"Memphis was not playing last season. It was not that last season he was playing phenomenally and now this season he is not playing at all. That's not the situation."