Arsenal suffered a shock 2-0 Champions League defeat to Braga at Estadio Municipal.
The Gunners, beaten by rivals Tottenham on Saturday, had been top of Group H and thrashed the Portuguese side 6-0 in their opening fixture.
However, a much-changed side never hit top gear and were denied a cast-iron penalty by Hungarian referee Viktor Kassai before Braga scored two late breakaway goals from Brazilian striker Matheus, leaving Arsene Wenger’s men not yet assured of their place in the last 16.
Wenger had made seven changes from the team which threw away a 2-0 lead at home to Spurs, including a return for Denmark striker Nicklas Bendtner, who had previously hit out at a lack of opportunities.
83′ [1 – 0] Matheus
90′ [2 – 0] Matheus