Gunners striker Pierre-Emerick Aubameyang, who also missed Saturday's 2-1 win over Huddersfield with illness, travelled along with Granit Xhaka who returns after a groin injury.
Borisov had never previously won a European knock out game in their history and hadn't played a competitive fixture for two months, just to rub salt into the wound.
"It's bad news with the red card".
With no game at the weekend, Arsenal can turn their full attention towards completing a comeback in the return leg on Thursday at the Emirates Stadium.
"I trust in our players and I trust in our stadium and supporters", Emery said.
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The Frenchman was dismissed late enough in the contest that it didn't make an impact on the first leg of the tie, but needing to win by two goals to go through by right when the clubs meet in London, his absence could be felt down the line.
"It's a hard match".
"Today the first half was a good performance for us, we had chances to score, sometimes last week our chances were a goal and today is not".
That is some relief for Cech, who told reporters after previously stating his desire to head into retirement this summer on the back of another trophy triumph: "It was one of those games where if we played for another couple of hours probably we wouldn't have scored".
'Letting the team down like that is the worst feeling, ' the France global wrote on Twitter. "We are going to play another 90 minutes next week and I'm sure it's going to be different". "Next week we aren't going to play with him but now we are going to think with the players that are okay for next week".
Despite winning 13 consecutive league titles, the club have struggled in Europe and this is only the third time they have made it to the Europa League knockout stages.