The Dutch club released a statement that confirmed the Morocco international will join the Premier League club in July.

The transfer is worth £33.3million and could rise to £36.7m with potential add-ons.

With Ziyech, Chelsea now have one of Europe’s hottest talents scoring 49 goals in 160 matches for Ajax.

Last season with Ajax, he won the Dutch title and KNVB Cup and was also named named Dutch footballer of the year in 2018.

The arrival of Ziyech will provide competition for places at Stamford Bridge with Pulisic, Pedro, Callum Hudson-Odoi and Willian.

Ziyech becomes Lampard’s first signing as Chelsea manager following a no way January transfer window which left him frustrated with the club’s lack of activity.

He said: “We have become the underdogs and the outsiders because the teams within have all strengthened. It’s the fact.

“Each time I check the  TV, a player has signed for another club.”

Following the official announcement, Ajax took to Twitter and congratulated Chelsea on their new signing and promising that their investment will pay dividends as long as they show faith in his abilities.

The Netherlands club wrote: “Hey @ChelseaFC, you have to believe in him. And great things shall happen.”