 Mamadou made his debut for the club on 30 August 2008 in a league match against Sochaux appearing as a substitute in a 2–1 victory.It took him almost four months to score his first goal for the club, which he accomplished against Lille on 30 November in a 2–2 draw.Due to not living up to expectation by some, he was criticized by the local media and supporters alike for his low strike rate, appearing in a total of 32 matches, but scoring only 2 goals.