Tiendalli’s return was short-lived as he fractured his lower leg, which kept him out for the rest of the year. On recovering from his injury, he was told by Feyenoord that he would be loaned out. Feyenoord loaned Tiendalli to city rivals Sparta Rotterdam on 25 January 2008, where he was re-united with his former Utrecht coach Foeke Booy. Tiendalli made his debut for Sparta Rotterdam on 26 January 2008 as a member of the starting line-up, setting up the second goal in a 2–1 win over FC Twente. He became a first-team regular, helping them avoid relegation and making thirteen appearances in all competitions.