"Kovacic, it is better to have rest with a little injury". Luiz fell out of favour under Sarri's predecessor, Antonio Conte.
Willian made no secret of the breakdown in his relationship with Conte, previously saying there was "no chance" he would have stayed at the club had the Italian not left.
"We have spoken and I told him he can score 40 goals", he said.
Last decade saw a golden age for English clubs in the competition, with Liverpool and Chelsea locking horns in a number of epic battles which saw the Merseysiders get the better of their west London rivals on most occasions.
As with most World Cup stars, he was given an extended holiday after the tournament and missed some of Chelsea's pre-season.
The Blues start their Europa League campaign at PAOK on Thursday having won their first five Premier League games under Conte's replacement. "Clearly the players you are referring to are very high level players and I would like to keep them in my squad".More news: Yusaku Maezawa booked all seats on SpaceX moon shot. Who is he?
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Sarri is expected to make several changes for the match against PAOK tomorrow.
Chelsea man-in-charge Maurizio Sarri has also provided some information regarding the injury of the youngster Ruben Loftus-Cheek.
The 59-year-old former Napoli boss said: "In order to win our group, the match of tomorrow is the most important because it's the most hard match".
"In the first part of the season it's very important to play possibly with the same players". He then returned and has been on top form for the side, now leading the race for the Golden Boot with five goals in five games.
Pellegrini spoke today ahead of the Chelsea game and revealed: "Marko finished with a problem in his knee, he has had some treatment, we will see if he is fit for Sunday".
That has led to some talk of whether he could emulate Mo Salah's stunning effort from last season and catapult himself into the top echelon of players in the world, alongside Cristiano Ronaldo and Lionel Messi.