Welbeck is nearly certain to miss the rest of the season, along with pre-season.
"He's a player I rate really very highly". First it's in your mind - you think for the player.
Rob Holding: "I didn't see it because obviously I'm at the other end of the pitch so I didn't see exactly what he'd done".
Diogo Jota missed the Spurs game with a quad injury, but is available for Sunday.
The only blemish on a great opening half from the Gunners, apart from a lack of goals, was an injury to Danny Welbeck which saw him go off after half an hour.
"We are going to wait for news on this injury, but we think it is serious".
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Mohamed Elneny (thigh) and Konstantinos Mavropanos (groin) are still missing, while Matteo Guendouzi is back in domestic contention after serving a one-match ban.
The Portuguese lost 1-0 to Arsenal in the first leg at home but were determined not to leave the Emirates empty handed.
That would mean he will not play again this season and potentially cut short his Arsenal career prematurely, given that he is out of contract in the summer.
The Gabon striker was certainly Arsenal's liveliest attacking outlet and he sent another shot just wide of Renan Ribeiro's goal as Arsenal looked to snatch the lead.
Emery's side are defending a 14-match unbeaten run after Saturday's 1-1 draw with Liverpool extended a streak that stretches back to August.
Giroud was handed a start by Sarri as Alvaro Morata, scorer of five goals in his last six appearances in all competitions, was excused from the trip to Belarus.
What a game this promises to be. It was the Frenchman's first Chelsea goal since May, but Maurizio Sarri is not anxious about him.