"I have to go in the direction of the players, but they also have to go in my direction," Mourinho said at a press conference before United's Europa League quarter-final second leg against Anderlecht.
"Since September, Rashford has not scored in the Premier League, but he was always a player I chose. He was always a player I support because he was always coming in my direction and giving me what I want, so it is about that.
"Do I think Anthony is a player with great potential? Yes. Do I think he can play successfully for me? Yes.
"But he needs to give me things that I like."
Mourinho added: "We are together for almost 10 months and I know the players much better now, they should know me much better now."