The Bees, who were playing their very first Premier League game, scored on either side of half-time to beat the Gunners and put pressure on Mikel Arteta’s side after just one game of the campaign.
Defensive problems have once again been Arsenal’s downfall despite Ben White costing £ 50million making his competitive debut for his new side.
One man who was not on the squad was midfielder Lucas Torreira, who continues to be linked with a departure from Emirates Stadium this summer.
The 25-year-old, who is now in the final two years of his contract with the Gunners, spent last season on loan at Atletico Madrid and could leave England before the transfer window closes at the end of the month.
According to Italian media Gazzetta Dello Sport, the Uruguayan international is admired by Lazio boss Maurizio Sarri and the former Chelsea manager wants to bring him to Rome.
Torreira took to Twitter on Friday night to share what he did during the day, which might not have been the best moment given his side were beaten by Brentford at the time of posting (9 p.m. ).
The underprivileged Arsenal midfielder visited a theme park in Madrid, where he lived last season when he was loaned to Atletico.
Torreira, speaking last month, admitted his frustrations with the Gunners
“A year ago I was working with a psychologist in Spain because in my second year at Arsenal I played very little,” Torreira said via the metro.
“It was hard for me to really assimilate it because my life depends on football and when I’m not playing I’m having a really bad time, I’m in a really bad mood and a lot of things happen.
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“That’s why I started with him and he was helping me out on this.
“Many years ago they said to you ‘but how are you going to see a psychologist, are you crazy?’ And today, it is very important, especially for us who live many situations far from the family ”, he concluded.