Donny van de Beek has been pictured in a Manchester United kit for the first time since signing on Wednesday.
The 23-year-old becomes Ole Gunnar Solskjaer's first transfer of the summer.
Ajax accepted a bid of £34m plus £4m in add-ons after Van de Beek told them he wanted to leave for Old Trafford.
The Dutchman has penned a five-year deal, with an option to extend it by another season.
And a picture of him donning the famous United shirt has emerged after the Netherlands international rushed to change his Instagram icon.
Van de Beek made 175 appearances and scoring 41 goals for Ajax, the club he grew up with after coming up through their academy.
But the midfielder has decided it is time to leave the Eredivisie and has stated how excited he is to move to Manchester.
"I cannot begin to explain how incredible an opportunity it is to join a club with such an amazing history," he said.
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"I am now ready to take the next step in my career and perform at the highest level and there is no higher standard than Manchester United.
"This team has some of the best midfielders in the world and I know that I can learn from them and also bring my own strengths to the group.
"Having spoken to the manager about his vision for this team, the direction that the club is going in is hugely exciting and I cannot wait to be a part of that."
Van de Beek was an integral part of the Ajax side that made it to the Champions League semi-finals in 2019.
However, that team has now lost many of those players that helped make that memorable run, with Matthijs de Ligt, Frenkie de Jong and Hakim Ziyech all departing.
United will now move on to other targets Jadon Sancho and Dayot Upamecano as club chiefs look to deliver on their promise of signing three players for Solskjaer.