He was also unlucky not to get on the scoresheet himself, racing clean through on to Jorginho's clipped pass only to be denied by an inspired Petr Cech.
The 17-year-old has been very impressive during pre-season and he demonstrated that once again against the Gunners.
At a club famed for its dominance of academy football and then the difficulty for those young players of actually breaking into the first-team, it was a significant statement that will hopefully also herald a change of approach under Sarri.
'It's true I called him a genius but his genius is a bit one-dimensional, I saw him play in only one way, ' he said, according to The Mirror.
Sarri wants to hold talks with the winger as he admitted he is not happy with Willian's situation, labelling it as unusual. We are talking about top players and every club wants to keep their top players. However, the club does have a clause with the option to extend the contract for another season. In the last six years he has matured more than in the first 30.
The Belgian striker had a hard start to life as a Chelsea player despite having an impressive repuation when he arrived from Marseille. He is already the technical and tactical leader on the pitch, and the rest of the Premier League should be relieved that Pep Guardiola did not manage to bring him to City.
Morata's future at Chelsea FC has been a source of speculation this summer, but as things stand he is set to stay at the Stamford Bridge outfit.
"The starting XI today is very near to the starting XI in the Community Shield".
Not only has he started all of Chelsea's pre-season friendlies so far, but along with summer import Jorginho he has probably been their best player.