On 15 March 2013, Owusu signed a three-year contract with Ajax, tying him down to the club until 30 June 2016.[1] He made his debut for Jong Ajax as a half-time substitute for Joël Veltman in an Eerste Divisie match against Telstar on 11 August 2014.[2] In November 2014, Owusu extended his contract with Ajax until 2019.[3]