The visitors looked to be slipping to a 12th Premier League defeat of the season when Tomas Soucek netted West Ham's third goal in a 32-minute spell of incisive finishing by the hosts and defensive inadequacy by Arsenal.
We knew it was going to be a very difficult game but we have a very good group.
Sunday will be a tough game.
He's a player that's happy when he makes the team better.
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Three minutes into the second half, though, Martinelli put Arsenal in front with a Thierry Henry-esque finish into the far corner after being slipped through by captain Lacazette.