The five-year deal, which will see Lukaku pocket more than £200,000 per week, is a record transfer between two English clubs.

The Belgian international striker quickly got into the groove, taking part in passing drills with French star Pogba and other teammates in blazing sunshine at the UCLA facility near Beverly Hills.

Pogba and Lukaku, who share the same agent, are close friends and were on holiday in Beverly Hills last week together before the deal was completed.

Lukaku, who could make his debut in Saturday’s tour opener against the Los Angeles Galaxy, said Pogba had played a “big role” in his transfer.

Romelu Lukaku trains with Paul Pogba in Los Angeles as Manchester United move nears

“He is one of my best friends and he is my neighbour as well,” Lukaku said.

“We are always together on a daily basis so he would explain to me how things were going. Last season when he signed for United, to have witnessed that, it really triggered something in my brain and I knew that if one day I had the chance to sign then I would not say no.

“You just know and realise how big the club is, and the hunger it has to win trophies. I would like to say, at the end of my career, that I played for a team that has always challenged for trophies and this is what the club has always done.

“To be here now is a blessing and I will not take this opportunity for granted.”

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Lukaku’s transfer reunites him with Jose Mourinho, who famously sold the striker to Everton in 2014 during his second spell in charge of Chelsea.

The two men engaged in an often spiky war of words following Lukaku’s move to Everton, with Mourinho questioning the striker’s “mentality” and motivation to be successful at Stamford Bridge.

However, as Mourinho declared Lukaku a “natural fit” for United, the striker said he was looking forward to working with the Portuguese manager once more, insisting the two had a solid relationship.

“Me and him, we have a really good relationship and I always dreamed to play under him since I was 10. To have the opportunity at 24 to work under him and to be part of his plans for challenges for trophies is exciting,” Lukaku said.

Belgian forward Romelu Lukaku completes move to Manchester United in record deal

“I think he is a manager to help us to win trophies and I can’t wait to start working under him again.”

Lukaku, who lives in Manchester, revealed he had harboured a long-time desire to play for United, who won their 42nd major trophy this year with victory in the Europa League final, putting them one clear of bitter rivals Liverpool with 41.

“I live in Manchester so I pass Old Trafford many times when I want to go to the city centre,” Lukaku said. “One night I said to my mum that I would play there one day. I thought so. I had a certain feeling.”

In the short term, Lukaku is looking forward to realising his goal of playing in the Champions League next season.

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“Finally! Finally! I have been a pro for eight years and I have never had a taste of the Champions League group stages,” Lukaku said.

“It is something I have always wanted, that competition has something, I want to see how it is and to have a taste.”