Under the terms of the deal, Sandler will stay at Zwolle for the season and team up with the Blues this summer.
“I thought initially that they were keeping tabs on me and did not expect them to approach me or PEC Zwolle during the winter break to transfer to the club.
“But that is what happened and I am delighted.
“City scouts came to Amsterdam for talks, and they showed how they go about their business and I was very impressed with the plans that they have for me.
“I am really positive about my impending transfer, it's like a fairy-tale.
“The best manager in the world, Pep Guardiola, is currently in charge there, and he can teach me a lot, and also the style in which they play football attracts me a lot.
“I watch a lot of football and City are in great form this season, blowing teams away with great football in the Premier League and the Champions League.
“I enjoy watching them, and not just because I will transfer to the club this summer. Although I do look forward to facing Sergio Aguero on the training ground!"