Rennes sporting director Florian Maurice has admitted he expected Tanguy Kouassi would join the club at a time his future with Paris Saint-Germain was up in the air.
The teenage centre-back made his senior breakthrough during the 2019-20 season, making six appearances in Ligue 1, and scored a brace in a 4-4 draw with Amiens.
He also had two outings in the Champions League, one of which was a 5-0 win over Galatasaray in the group stage, the other against Borussia Dortmund in the Round of 16.