 On 4 June 2008, Matmour joined newly promoted Bundesliga club Borussia Mönchengladbach on a four-year contract, with the team paying his former club SC Freiburg €2 million for the transfer.Matmour made his Borussia Mönchengladbach debut, where he started and played 61 minutes before coming off as a substitute, in an 8–1 win over VfB Fichte Bielefeld in the first round of DFB-Pokal.A week later, on 17 August 2008, he started the whole game, in a 3–1 loss against VfB Stuttgart in the opening game of the season.