Van Sas will join the Citizens on a one-year scholarship before signing a three-year professional contract next year.
The 16-year-old is considered a major talent in the Netherlands and big things are expected of him.
Barcelona, Manchester United and Ajax were all interested in signing the 2004-born shot-stopper, an indication of his talents.
Utrecht will receive a small compensation fee from Man City for Van Sas.
Van Sas won four caps for the Netherlands U-15 side before moving up to U-16 level, where he has played twice.
FC Utrecht have now officially announced that Van Sas has joined Manchester City.
Heel veel succes in Engeland, Mikki! 👍 https://t.co/6FdBpGRgLs
— FC Utrecht (@fcutrecht) June 9, 2020