On 30 August 2008, Aissati took place on the bench against Willem II but was not used - the club lost 2–1. Aisatti suffered a knee injury on 24 September 2008 and was expected to be sidelined between five and six weeks. It came after he suffered a knee injury a week before during the reserve match. However, the rehabilitation took longer than expected and Aissati did not play an official match for Ajax in the year 2008. In December Aissati trained again and played a few games with the Ajax reserves, but he took it easy to not rush anything. He made a comeback in the reserve against N.E.C. on 16 February 2009, On 22 February 2009, Aissati finally made his debut for Ajax in the 60th minute to come on for Robbert Schilder in a 2–1 draw against FC Volendam after a months of rehabilitation for his knee injury. Aisatti provided assists at his first season at Ajax and on 5 April 2009, Aissati scored his first goal for Ajax in a 2–1 win over Roda JC. In his first season, Aissati made nine appearances and scored once.
