Rennes and Doku have renewed their contract, with the club increasing the release clause to €70 million.
The news was announced on Wednesday by Rennes' official website, which stated that the club had reached an agreement with the player's representatives to extend his stay at the club until June 2025.
Doku, who has been with Rennes since 2019, has made over 80 appearances for the club in all competitions, scoring eight goals and providing six assists.
He was named in the Ligue 1 team of the season last season, and he is known for his technical ability and creativity on the pitch.
The increase in the release clause will allow Rennes to retain control over Doku's transfer value should they wish to do so in the future.
The move comes as a relief for both Doku and Rennes, who were linked with a potential move away from the club earlier this year.
Rennes fans will be hoping that Doku can continue to perform at a high level and help the club achieve success in the coming seasons.