Ivan Toney scored an equaliser as Brentford left Arsenal with a draw that could blow the Premier League title race wide open.
Their main title rivals, though, host Aston Villa on Sunday before travelling to the Emirates Stadium on Wednesday night for a game which could prove pivotal.
Mikel Arteta stuck with the same starting XI that had been turned over at Goodison Park and they struggled for creativity as Brentford wasted a host of opportunities to take the lead.
Toney hit the crossbar when he should have broken the deadlock as the visitors started in the vein of a team on a nine-game unbeaten league run.
Brentford had plenty of men behind the ball, relying on their strikers when they could get forward as Toney worked Aaron Ramsdale with a strike from distance.
Brentford, though, still threatened and missed another gilt-edged chance to take the lead, Toney’s low effort flashing wide of the post having been picked out inside the box by Mathias Jensen.
Arteta went to his bench in search of the winning formula, January signing Trossard replacing the ineffectual Martinelli down the left-flank.
Live Score reports that it took just four minutes for his decision to pay off, the Belgium international arriving unmarked at the back-post to turn home a fine Saka cross and open his Arsenal account with 66 minutes on the clock.
Still, though, Brentford were in the fight and levelled eight minutes after slipping behind as Toney headed home into an open net after Arsenal failed to deal with a free-kick into the box.
Like last week at Everton, Arsenal failed to create any meaningful chances in the closing stages and had to settle for a point, leaving them hopeful for a favour from former boss Unai Emery and his Villa side on Sunday.
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