The Italian angrily threw his hat to the ground and booted it twice before heading down the tunnel at Baku Olympic Stadium, where the Blues meet Premier League rivals Arsenal on Wednesday.
The incident ruined the final 20 minutes of the hour-long session with Luiz following his boss to the sidelines and taking no further part.
"[He said]: 'No, no, coach, I want to play, I want to play, I want to play, I want play, it is very important for me, it is very important for the team, I want to play'".
"For me, at the beginning of the season, it was really very hard to understand my players, to understand the mentality", Sarri said.
Owen continued: "Arsenal's last eight goals in the competition have been shared by Pierre-Emerick Aubamayang and Alexandre Lacazette and Emery - after much soul-searching and debate - has found a successful system to accommodate both stable stars in his starting XI".
"But after, in his mind, he was thinking "my future, my future, my future" and something I said to him and in the press conference [was] he was a little distracted".
"I thought they would be scrapping over extra tickets and they've given half of them back".
"I just want to say boys, all the best", Ramsey said in a video on his Instagram account. But this is not the moment. "Now we need to think only of the final because our feeling is that we deserve to win".
Emmanuel Petit, former Arsenal midfielder: Chelsea win If [Chelsea] win the Europa League, they'll have a European trophy, which alongside their earlier Champions League qualification, translates to a good year for Chelsea. the important thing is to win games and win trophies, and they're in a good place to do that. Now we have to think only about the final.
And the prospect of losing Hazard to Real Madrid? Of course, we are preparing to be ready and we are going to go for it.
"I want to respect his decision, I hope he will stay with us", Sarri said.