But Hargreaves says Loftus-Cheek has shown he should be given more of an opportunity by Sarri.
"He's improving. He needs to improve in the defensive phase, but it's not only Loftus".
Asked if Sarri had improved him, he said: "Definitely, but I'll always improve as a player day by day, technically and tactically from training".
Chelsea continued to dominate and shortly before half-time Loftus-Cheek went close to completing his hat-trick with a header, again after being set up by Zappacosta.
Jorginho and N'Golo Kante look to have nailed two of the three positions available, but competing for the final place are Ross Barkley, Cesc Fabregas, Mateo Kovacic and Loftus-Cheek. This little problem, I don't know how to solve it.
I need to come and get on the ball, connect with the midfielders and the wingers, and then I need to attack the box after that - but not to be in the box all the time. However, Sarri made it clear that the player was a big part of his plans and, if ESPN are to be believed, the Blues have moved to tie him down for the foreseeable future. Maybe in the future I will able to play them all the same time, and play Loftus.
Aside from Hazard, the only confirmed injury absentee is Ethan Ampadu, who remains sidelined for the next week or two with a knee problem.
"It's very hard to solve the tactical problem without an improvement in the defensive phase with these three midfielders". So we need to change some of them. "We can try and we will work, but I need the cooperation of the players".