As it is, the 3-1 defeat means they must score at least two goals in the return fixture, but PSG themselves are certainly capable of scoring in London due to their phenomenal attacking threats.
Things will certainly be made easier for Chelsea after it was confirmed that Zlatan Ibrahimovic will miss the second-leg due to the injury he sustained in yesterday's match. Zlatan suffered a hamstring injury in the 68th minute of the game and had to be replaced by Lucas Moura. The Swede will now be out for a few week which will see Chelsea breathe a sigh of relief.
Thiago Motta still believes PSG have it all to do, and past success means that Chelsea will be full of confidence going into the game next week. Speaking to L'Equipe Motta said "They remain the favourites, they have such an experience in European Cups, such players and they will be even better on hostile terrain next week."
"The last 30 minutes of the first period in Paris, they were huge. There were so many key things that happened in the game - the penalty that wasn't given to Edinson Cavani, Zlatan Ibrahimovic's injury - but we showed we knew how to react and recover."
Motta's comments are almost akin to something Jose Mourinho would say. Countless times this season he has written off his side's chances, claiming they have no chance to win the Premier League and that they are just "little horses." Realistically he knows his side still have a great chance in both competitions. Motta will also know that their 3-1 lead is a convincing one, and that two goal advantage could prove to be enough.
Edinson Cavani is more confident than his teammate however, "This is a great victory," the striker said. "But in football, everything is possible, even if our possibilities are obviously large thanks to the goal at a key moment by Pastore."
Chelsea can of course draw confidence from their remarkable run to winning this competition two years ago, inspired by Roberto Di Matteo. Even though they are two goals down, you would probably favour Chelsea over Manchester United to progress from their respective ties.