Cech came out to catch/punch a corner in the seventh minute but failed to get any sort of contact on the ball and Brighton defender Shane Duffy would head back across goal for Lewis Dunk to slam home from inside six years to give the Premier League newcomers the lead. Here are five things we learned from the 2-1 loss. Although there was plenty of poor defending all around in this Gunners side, Cech took blame for both first half goals.
Taking to Twitter, he wrote: "If you want to win a game away from home in the best league in the world your GK can't concede 2 goals like I did today".
Arsenal fans were quick to criticise Cech for his costly errors, and made their feelings known on social media. "The team fought back but the damage was done", Cech tweeted.
'I think he deserves a lot of respect as it's his assessment of his own performance, ' said the Arsenal manager.
"He's a very intelligent guy and professional guy. We have to stick together; we have no other solution".
"When the players don't do well, you have as well to live with it".
However, the Premier League encounter only added more misery in the Gunners' camp, as Arsene Wenger's men were handed their fourth successive defeat by the Seagulls.
The loss against Brighton was the first time that Arsenal lost four consecutive games in all competitions since 2002.