Morata has lost his place to Frenchman Olivier Giroud and Sarri admitted the Spaniard was in severe need of confidence boost to rediscover his touch in front of goal for the Premier League leaders.
'So there's no arguments from my point of view, hence why I've not seen him.
Bernd Leno frustrated at being Petr Cech understudy at Arsenal
Bernd Leno has told Unai Emery he joined Arsenal expecting to play every week and he is frustrated playing backup to Petr Cech .
The France striker has made three assists to help the Blues maintain their 100 per cent start to the season. But the confidence can come with goals. "In this position I am also in the last match played Pedro and Hazard but I have also players like Willian, Moses and so I don't know tomorrow if it is time for Odoi or somebody else", Sarri was quoted by Metro UK as saying.
Chelsea's game in the ancient city of Thessaloniki, the second largest in Greece, is their first in the Europa League since winning the competition in the 2012/13 season. "He was on the ball and was active". We have had a lot of opportunities. For us, it is very hard.
"I want to think we have played very well". It was hard for people to play against us this evening.
Chelsea will next face West Ham United away from home in the Premier League on Sunday and it remains to be seen if Barkley will be involved.