But the players have no time to mull on the result, as the Europa League returns with Hungarian side Mol Vidi travelling to Stamford Bridge.
On Thursday, England manager Gareth Southgate will name his squad for games against World Cup runners-up Croatia and Spain in the Nations League.
The Italian continued by referring to Barkley's serious hamstring injury at the beginning of last season, stating that he has bounced back strongly in the face of adversity. I think he can improve more because he has the potential to improve more and so I think that he can return in the national team.
"I would say Sarri's philosophy has helped me..." Right now I'm ready to understand every aspect of the game.
"To play in the Champions League is more important at the moment".
Barkley, who made his England debut in 2013 and has 22 caps, was an unused substitute against Lithuania in March but was left out of the World Cup squad, as England reached the semi-finals in Russian Federation.
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Chelsea FC have made a strong start to the new season and they are now third in the table and just two points behind joint leaders Liverpool FC and Chelsea FC.
The Blues will be hosting Hungarian club Mol Vidi FC in the Europa League this week.
Asked if there is pressure on Loftus-Cheek, Sarri added: "The pressure is normal for the player of a high level. Loftus-Cheek was unlucky in the last three weeks after the match with the worldwide team, he had a problem but in the last five or six days he has been better, he is able to play tomorrow".
"So he has to get used to the pressure".