Alexandre Lacazette was sent off as Arsenal suffered a shock Europa League defeat to BATE Borisov in the first leg of their last-32 tie, with Stanislav Dragun's header separating the sides
  Unai Emery's team spurned early chances in the first half through Henrikh Mkhitaryan and Lacazette, before BATE scored on the stroke of half-time as Igor Stasevich's whipped free-kick was headed powerfully past Petr Cech by Dragun
In the second half, Lacazette had the ball in the net in the 56th minute but was ruled offside
 Emery threw on Lucas Torreira, Pierre Emerick Aubameyang and Denis Suarez from the bench but to little avail and frustrations boiled over when Lacazette was dismissed for elbowing Aleksandar Filipovic in the 86th minute
Arsenal began brightly and might have grabbed an away goal in the opening moments when Sead Kolasinac set up Mkhitaryan for a close-range chance that Denis Scherbitski in the BATE goal saved well
Midway through the first half, Lacazette should have done better than head another Kolasinac cross over the bar
 Dragun's goal was the first time Arsenal had conceded in the Europa League in six matches but came as BATE began to reassert themselves after their nervy start
After Nacho Monreal had conceded a free-kick near the touchline, Stasevich whipped in the ball from the right flank and Dragun climbed above Kolasinac to beat Cech
Alexander Hleb, in his fifth spell with BATE, and playing against his former club, lasted until the 58th minute
 Two minutes earlier, Lacazette had slid the ball into the net from yet another Kolasinac cross but his effort was ruled offside
With Arsenal struggling to find their rhythm, Emery threw on Torreira, Aubameyang and Suarez on from the bench, as BATE sat back
With five minutes remaining, Lacazette reacted angrily to a challenge from Filipovic and swung an elbow towards the Serbian defender which resulted in a straight red card from referee Srdjan Jovanovic, meaning the Frenchman will miss the second leg
Dragun's45th-minute header past Cech was the difference between the teams, and came after a well-executed set-piece move
The midfielder had already made a contribution in calming Arsenal's initial dominance and was a key man in the defensive effort that saw BATE to victory
Having gone out of the FA Cup, Arsenal now have a week off before the return leg against BATE at the Emirates on Thursday, February 21 at 5
55pm
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