Any team who beats a star-studded PSG side to win a trophy, no matter what the competition, must be doing something right - Stade Rennais are undoubtedly the next up-and-coming side in French football.
The team managed by Julien Stephan beat the Ligue 1 champions in April 2019, tightly on penalties after a 2-2 draw at the Stade de France to secure their first trophy in 48 years, and have only been on the up since.
But how much do we actually know about Chelsea's next opponents in the Champions League - and could they spring a surprise against Frank Lampard's side at Stamford Bridge tonight?