At the start of the 2014–15 season, Matmour scored his first goal of the season and set up one of the goal, in a 2–1 win over Eintracht Braunschweig on 24 August 2014. He started in the club’s first nine matches to the season, playing in the right–wing position. However, he missed two matches, due to suffering from a flu. But Matmour returned to the first team, coming on as a second half substitute, in a 1–1 draw against Fortuna Düsseldorf on 25 October 2014. Two weeks later on 7 November 2014 after returning to the first team, he set up two goals, in a 2–2 draw against VfL Bochum. However, Matmour’s return was short–lived when he suffered a flu that saw him missed two matches. But Matmour was able to return to the first team in a match against SV Sandhausen on 21 December 2014 and set up the only goal of the game, in a 1–0 win. However, his return was short–lived once again when he was not involved in the squad due to another flu and returned to the starting line–up, in a 2–1 win against Greuther Fürth on 27 February 2015. Matmour then scored his second goal of the season, in a 4–0 win over 1. FC Heidenheim on 4 April 2015. However, he was sidelined for the rest of the 2014–15 season with a thigh injury and the club went on to finish fourth place in the league once again. At the end of the 2014–15 season, Matmour went on to make 27 appearances and scoring 3 times in all competitions.