He is definitely not injured. He definitely has no issues with his shoulder any more," Rangnick said of the Mancunian.
"We have spoken a lot about Marcus in the last couple of weeks and I have personally spoken a lot with him. It's with him like with all the other players, when it counts and they are on the pitch, they just have to perform and I am pretty sure he is not happy with his performances right now.
"Is he not happy? I don't see any reason why he should not be happy? Our results have been good in the last couple of weeks and months.
"Right now he is trying to find his best possible shape and performance, and we just try to give him helping hands with everything we can. We show him video footage and we speak with him regularly.
"In training he is in top form. That is why I decided to play him (in Madrid). Now it’s about having that transformation from training performance to the competition in the league - and this is the next step he has to take."
He added: "We had a very similar situation, if I remember, with Jadon six or seven weeks ago.
"He is the best example of what can happen, again it’s the player himself who has to perform and get the best out of his own performance - and this is the same with Marcus."