Fellaini told manutd.com: "I'm very, very happy. It's a big moment for me. I waited for a long time, I've worked hard for this and I'm very happy to join this big club, this great club. I hope to do everything for this club.
"Of course. It's the biggest club in the world so of course I wanted to join this club. I tried everything to join the club.
"It's been difficult, a very long day. I waited to the end I know the situation, but this day has been very long.
"It's a big stadium, a big club. I hope I can score a lot of goals for Manchester United.
"When I was young it was a dream to play for Manchester United. Now I'm here so I'll try to give my best to the club. I want to win trophies. That's the most important thing."
For the big stories and the banter follow us on Twitter: @tribalfootball