Mourinho addressed claims of Rashford wanting to leave at today's media conference.
"The kid is a good kid. The kid is a good player," he said.
"The kid knows what Manchester United did for him, starting in the academy, then Mr Van Gaal's support, then my support and the club's support and the new contract and the new shirt and being selected for every single match since I am here.
"Marcus Rashford was selected for every single match. He was never one day out of selection because of my decision. He knows and that is the most important thing.
"But again, media is very important and I think it is very important that Manchester United supporters know the truth. That is why I am going so specific about these numbers."