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Arsenal suffered a crushing blow in the Premier League as they lost 2-1 to Watford at the Emirates Stadium on Tuesday.
Younes Kaboul and Troy Deeney gave Watford a two-goal lead within 14 minutes to stun the Gunners. Alex Iwobi struck back in the second half, but Arsenal failed to find the equaliser in the pulsating finale.
Granit Xhaka was suspended for Arsenal, giving Francis Coquelin a start in midfield next to Aaron Ramsey.
AC Milan forward M'Baye Niang made his Watford debut, on loan with the Hornets after his temporary switch from the Serie A giants.