The 16 year-old's move to City was confirmed by his Eredivisie club this morning.
"We say goodbye to Mikki with mixed feelings. On the one hand, we regret that in the person of Mikki an incredibly talented goalkeeper leaves our Academy. We would of course have liked to see Mikki shine in the Galgenwaard Stadium in the long term, which is what we train for," says technical director Jordy Zuidam on the club's website.
"On the other hand, Mikki indicated that he really wanted to make this move and we see his transfer to Manchester City as a compliment to our youth academy.
“This transition is confirmation of the elevated level of the Academy. We have reached an agreement with Manchester City on the transfer terms and all parties are satisfied. We wish Mikki every success in England."