After Deeney's penalty miss, Mkhitaryan added a third when he shot past Karnezis following Aubameyang's pass for his first league goal for the Gunners.
Having already turned out for them in the Champions League this season, Aubameyang can not represent two sides in the same UEFA event across any given campaign.
As he will play no part in the second leg of a Europa League last-16 encounter with AC Milan on Thursday, and with Arsenal out of the FA Cup and the next worldwide break approaching, Aubameyang will have to wait until April 1 for his next outing against Stoke.
Ainsley Maitland-Niles conceded a penalty with a foul on Pereyra, but when Deeney stepped up to take the spot-kick, Cech made a fine save. I can't play every three days.
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Petr Cech (Arsenal): It's been a tough time for the keeper, who was forced to accept some responsibility after a bad result last weekend against Brighton.
"It's an unbelievable personal milestone and we took only 18 games to reach nine clean sheets at the start of the season, so when you reach 199. we had to wait 11 games, which is sometimes frustrating but the most important is when the team wins", he told Sky Sports. "Fantastic motivation, fantastic desire and remarkable intelligence", he said.
The striker said Arsene Wenger's side lacked balls after their 2-1 loss to the Hornets earlier in the campaign. "Then you carry the chance that you might qualify for the Champions League". "It was not as easy a game as the score says".
"The spirit kept us out of trouble".
Besides, Arsene's good relationship makes it all the more hard to get rid of him, which remains the best thing for this football club at the end of the season regardless if we win the Europa or not.
After losing to Tottenham Hostpur, Mancester City and Brighton & Hove Albion, Arsenal got back on track with a 2-0 win over Milan in the first leg of the Europa League round of 16, and it maintained its momentum against Watford on Sunday, reports Efe. They face Stoke on April 1st, in their first game back after the worldwide break.