Sarri defended rotating his options, insisting rest was necessary for those left at home, while Kovacic acknowledged Liverpool's plight at Red Star Belgrade on Tuesday provided a cautionary tale. In the last match he played 30 minutes, the best for tomorrow is that he plays 45 to 50 minutes.
Manchester City striker Sergio Aguero was in a celebratory mood after becoming the second-fastest player to score 150 goals in the Premier League.
The visitors at least ended their five-game goal drought on the half-hour mark.
Chelsea lock horns with BATE Borisov in Belarus tomorrow evening, and we reckon Maurizio Sarri's going to make wholesale changes once again.
Liverpool and City were neck and neck up until the weekend's fixtures and Jamie Carragher, speaking on Sky Sports' Monday Night Football, believes that supporters of Jurgen Klopp's side need to "relax" after dropping two points behind Pep Guardiola's team. Perhaps once they're qualified the Blues boss will give Willy Caballero a chance but for now he'll have to make-do with a place on the bench.
According to the Mirror, the Blues are tracking the 26-year-old and could even firm up interest as early as the January transfer window if he continues to impress in the Premier League.
"We can not drop points, we need to work hard, keep improving".
"We know that to get to that chance, you have to get the three points like we did against Crystal Palace".
"So I think that, at the moment, we need only to think... to try to recover the large part of this gap".
Spanish striker Alvaro Morata scored the first goal for Chelsea in the 32nd minute after receiving a superb assist from Pedro.
Also, PSG will have to do more in convincing the player to remain at the club with suggestions that he is unhappy and bent on leaving the team.