 At Paris Saint-Germain, Landreau established himself as a first choice goalkeeper beating Jérôme Alonzo and youngster Nicolas Cousin He also became a fan favorite.On 5 August 2006, Landreau made his debut for PSG in a 3–2 loss against Lorient.In the 2006–07, the 2007–08 and the 2008–09 season, Landreau played all 38 appearance in his PSG Career.