Klaassen was one of the most exciting attacking midfielders in European football in 2017 when he joined the Toffees for a fee in the region of £24 million. However, he struggled to showcase his quality in the Premier League and made just seven top-flight appearances.
"Ajax will always remain special to me and I wanted to play at a higher level," he said. "The Eredivisie may not be that, but the training sessions at Ajax are of a higher level than at Everton or Werder Bremen."
Last season, Klaassen was on target 12 times in the Dutch top flight and this season he's helped Ajax excel in the Champions League, with the Amsterdam giants winning all six of their group games to storm into the last 16.
Need a VPN? Or seeking to switch? Then support Tribal Football by clicking here to sign up with our official partners NordVPN. Not only will you receive the best VPN experience, but also great discounts by signing up via Tribal Football. Thanks for your support!