The Spanish giants have won each of their six games under their new boss so far this season.
“(We know) everything, we have run the rule over their last few matches against AC Milan, Bordeaux and their last one against Valenciennes,” said Pellegrini.
“We know the players’ characteristics and the way they develop their play.
“They are a solid side with very good players, such as Lucho Gonzalez who was with me at River Plate in the Argentine league.
“Marseille have loads of potential. We will have to play very well to take the three points.”