Netherlands goalkeeper Maarten Stekelenburg has completed a move to AS Roma from Ajax for ?6.3 million ($9 million).

The 28-year-old Stekelenburg signed a four-year contract with the Italian club. He is new coach Luis Enrique's sixth offseason signing, following Bojan Krkic, Gabriel Heinze and others.

Ajax will receive further payment from Roma if Stekelenburg renews his contract and if the club qualifies for the Champions League.

Stekelenburg has made 40 appearances for the Netherlands, including last year's World Cup final.