Hakim Ziyech says he is delighted to be joining Chelsea and is already looking forward to next season with the Blues.
Chelsea posted an update on the transfer on Sunday evening - revealing a five-year contract had now been agreed with the player.
Earlier this month the club announced a deal had been agreed with Ajax for the 26-year-old subject to those terms.
The transfer is estimated to cost around €40million, potentially rising to €44m (£36). Ziyech will join in the summer when the transfer window re-opens.
The latest update reads: "Chelsea Football Club can today confirm that Hakim Ziyech has agreed the terms of a five-year contract. The Moroccan international will remain at Ajax for the rest of this season before making the transfer to Stamford Bridge in the summer."
Speaking for the first time on the transfer, Ziyech said: "I am delighted and proud to have signed for such a huge club as Chelsea. I am looking forward to next season and hope we can achieve great things together."
Chelsea director Marina Granovskaia added: "We are delighted Hakim will be joining us in the summer, having been a key target of the club’s in this last window. He has consistently been one of the most dangerous attacking players in Europe in recent years, which we saw first-hand in our two games against Ajax in the Champions League.
"We wish Hakim and Ajax all the best for the rest of the season and look forward to welcoming him to Stamford Bridge in the summer."
