The last 16's tie of the round is a big test for two teams in transition; Barca have had a forgettable season and doubts remain over Lionel Messi's future, while PSG must do without Neymar.
Kepa Arrizabalaga makes his first Premier League start since October, but Christian Pulisic is only a substitute again. With a win, Chelsea will go above Liverpool and West Ham into fourth.