Despite commending his former team-mate on his efforts in the dugout, Ronaldo said on Piers Morgan Uncensored: "He is doing his best.
"What are you going to do? Miracles. Miracles is impossible. We say in Portugal, 'Miracles is only in Fatima'... And he's not gonna do miracles.
"They have good players but they don't have, some of them, in mind what Manchester United is."
“Of course, he knows he has a huge impact with everything he said. What we need to focus on is in the future,” Amorim told reporters.
“We know that we as a club made a lot of mistakes in the past, but we are trying to change that. Let’s not focus on what happened, let’s focus on what we are doing now.
“We are doing that, we are changing a lot of things in the structure, the way we do things, the way we want the players to behave. We are doing that and we are improving, so let’s focus on the way we are doing things.
“We are improving, so let’s continue and forget a little bit the past.”