The 18-year-old has finally completed his move to Old Trafford after United agreed a £37 million deal with Atalanta on deadline day in October.
Diallo has signed a four-and-a-half-year contract with United and will train with Solskjaer’s first-team squad after securing a work permit.
After United officially announced the deal on Thursday, Solskjaer hailed Diallo as ‘one of the most exciting young prospects in the game.
And the Ivorian winger has revealed that United’s coaching staff have already been in contact over the past few months since the initial agreement had been reached.
‘After waiting since the summer, it is finally a dream come true to complete my move to Manchester United,’ Diallo told United’s official website.
‘I am hugely ambitious and there is so much that I want to achieve in the game; when I spoke to the manager I knew that I had joined the perfect club.
‘This is a really exciting squad with so many great players, I can promise that I will work hard every day to learn from them and give everything to develop my game.
‘I have had time to prepare for this move, both physically and mentally, and I have worked really hard to be ready to make the step up to this amazing club.’