The Everton star has revealed all about his stunning £90m move to United before the club’s official announcement.
The 24-year-old striker is set to join back up with Jose Mourinho in this summer’s biggest transfer.
The big Belgian has snubbed a return to Chelsea in favour of joining the Red Devils and is adamant the move is a no-brainer.
Lukaku told ESPN: "This is an opportunity that I've always wanted since I was a child.
"When [Manchester United] came calling, I didn't have to think twice. So I'm really delighted to hopefully be part of their history."
When asked why he chose to join United, Lukaku added: "I would say, 'Who would say no to the biggest club in the world?'
"Best stadium in England. The best fans. This is the perfect opportunity. I always said I wanted to play for a team that's challenging for every trophy that there is.
"I think Manchester United at the minute wants to be the dominant team, that dominant force. If you look at their history, it says enough.
“To become part of a club like them is something that I really wanted. I'm thankful for the opportunity that they gave me.
"Now it's time to work hard, work harder than I ever did before. I'm willing to do it. Hopefully, it will come a good way."
Current United superstar Paul Pogba has played a key role in getting Lukaku to Old Trafford.
Lukaku said: “I’ve been talking to [Pogba] for about seven or eight years. And now he's living in Manchester.
"I live in Manchester. He lives like down the road from where I live, so we're together on a daily basis.
"He was explaining to me how it went at the club, and it triggered something in my head. When the opportunity came, I didn't have to think twice. I'm really excited.
"All of [the Man United players]. I think they're all top players, a good group of guys that is hungry to win trophies.
"And to play in front of those fans, everything is set there to perform. But, you know, I have to work harder than I'm doing now. I know the road is still far, but I'm willing to go on that path and grab the opportunity that I get."
