 FC Kaiserslautern.Matmour then played in the right–back position for the first time after the club was low of right–back position, in a 1–0 loss against SV Sandhausen on 14 September 2013.A week later on 25 September 2013, he scored again in the second round of DFB-Pokal, in a 3–1 win over Hertha BSC.