He bobbed up again after Hector Bellerin's speculative back heel volley to twice head the ball through and was on hand to turn in the final cross from Pierre-Emerick Aubameyang.
The north London side have been quietly notching up a string of positive results in all competitions after having slumped to back to back defeats in the Premier League by Manchester City and Chelsea FC in their opening two games of the season.
"He can play anywhere, in any league, for any elite club".
The former England global thinks that the Arsenal defence is not good enough for Unai Emery's side to maintain a title challenge despite their nine-game winning streak. The England worldwide made the switch from the Emirates Stadium to Anfield previous year in what turned out to be an excellent move for the player, and former team-mate Aaron Ramsey could be set to tread the same path.
Midfielder Alex Iwobi praised the policy change prior to the Qarabag match: "It's good for us to train on the pitch as well so we can get familiar and get used to the pitch", he said.
"I trust and believe that if we do this, one day we will win the game".
Chelsea have two players in the XI while Manchester City dominate with three, but there are also call-ups for stars from Crystal Palace, Leicester City, Burnley and Everton as they enjoy eye-catching starts to the campaign.
Arsenal go into the worldwide break sat in the top four and will face Leicester City at the Emirates when they return to league action.
City defender John Stones said the players had decided among themselves that Mahrez would take the kick after impressing with his spot-kicks in training last week.