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However, the final deal was subject to personal terms and work permit, with the Red Devils forced to apply for agoverning body exemption before the winger could obtain a visa.
The Manchester outfit submitted the relevant paperwork on January 1and received approval on the same day, with Diallo officially becoming the first player to be registered under post-Brexit rules six days later.
The 18-year-old, who only made five senior appearances for Atalanta, has been handed the No.19 shirt previously worn by the likes of Marcus Rashford and Dwight Yorke, with big things now expected of a man who has already been likened to club legend Cristiano Ronaldo.
Diallo expressed his excitement after being unveiled at Old Trafford on Wednesdaybefore outlining his ambitions for bothdomestic and European success in the famous red shirt.
“I’m over the moon to be here. I’m so excited to start here at Manchester United. It’s a dream come true and I can’t wait to start and play with the guys," he told United's official website.
“I’m a little bit too anxious to say this given it’s just the start of my time here but my dream is to win the Premier League and the Champions League with Manchester United. That is my aim and goal.
Diallo has been in regular contact with fellow Ivorian Eric Bailly since being snapped up by the Red Devils, and he also thinks that Paul Pogba will have a key role to play in helping him to settle into his new surroundings over the next few months.
“Eric will be a definite reference point for me. I’ve actually already been in touch with him over the last few months and we’ve been chatting," he said.
"I’ll be asking him for advice and will be listening to all he says, and also the other players who speak French and Italian like Paul Pogba for example, he will be another good reference point for me.”
Diallo added on his Atalanta departure:“It’s been a little bit strange these last few months. I would have hoped to have played a little bit more with Atalanta, but it wasn’t possible.