Marseille ended their season with a 3-0 win over Bastia, but were unable to secure Champions League qualification.
Liverpool give U21s more game time than Premier League rivals but top flight lags behind Europe.
Bastia missed out on a fourth successive Ligue 1 win after drawing 1-1 with Caen.
PSG are on the brink of winning the Ligue 1 title after Caen stunned Lyon 3-0 on Saturday, while Metz were relegated.
Ten-man Bastia maintained their late-season revival and ended Rennes' six-match unbeaten run with a 1-0 victory.
St Etienne slipped up in the race for a Champions League spot in Ligue 1 after going down 1-0 to Bastia on Saturday.