The meeting, held in Rennes, ended with a score of 2: 1 in favor of the guests.
The Chelsea victory came with goals from Caluma Hudson-Odoi and Olivier Giroud, with 22 minutes and 90 + 1 minutes respectively.
Rennes responded with a goal by Seru Girassi, who scored in the 85th minute.
Thus, thanks to the victory over Rennes and the loss of the Russian Krasnodar, Chelsea advanced to the Champions League playoffs ahead of schedule.
In the next round, Chelsea will play an away game with the Spanish Sevilla, while Rennes will face the Russian Krasnodar.
Earlier it was reported that Krasnodar lost to Sevilla in the Champions League.