Speaking to the media for the first time since his summer transfer from Everton, the Belgian praised his former club, but says he now wants to win silverware with the Reds.
Fellaini said: "I talked with the manager because it was a big opportunity for me to join one of the biggest clubs in the world. He knew my objectives: I want to win trophies, I play football for this, and with Manchester United I have a big chance to win something.
"I thought I had no chance to join United but in the end I joined the club so for me it’s a dream. It’s one of the biggest clubs in the world. It’s a big dream.
"I need to work hard for my place because there are a lot of good players at the club. I need to work hard to show [what I can do]. I have a big chance with the manager and the staff. I’ve had a lot of games in the Premier League, I know the players and their quality. I think that’s good for me. Now I need to play and play well for the team – that’s it.
"I will prove myself on the pitch. Some people don't like my qualities, but I don't care. The manager, staff and players here know me. The manager gave me confidence [when he signed him at Everton]. I didn't know anyone, but he helped me."