PSG are still the strongest team in Ligue 1, Mbappe's departure has not affected the performance of the Parisians in the league, and in the UEFA Champions League PSG won their first match against Girona.
Rennes can be classified as a serious Ligue 1 rival, the team often fights for European Cup places, but lately Rennes are finding it increasingly difficult to compete with other top clubs in France. Last season Rennes finished only in 10th place, this season things are not the best either - 2 wins, 1 draw and 2 defeats in the first 5 rounds. So we do not think that Rennes will be able to take points away from PSG at the Parc des Princes.
Prediction: PSG to win. We recommend the “1 Win” bet, odds 1.43