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The defender netted the only goal of the contest after 64 minutes, punishing Spurs for a lapse in concentration from a corner as he drifted away from Cristian Romero to thump in Bukayo Saka's pinpoint cross.

The hosts had the better chances in the first half, through Dejan Kulusevski and Dominic Solanke, but were thwarted by David Raya's saves and some disappointing misses.

Despite Spurs' search for a late equaliser, Arsenal was able to hold out for the win and maintain its unbeaten start to the Premier League season.

Mikel Arteta's side is up to second on the table on 10 points, while Spurs are 13th after suffering a second defeat of the campaign.

But a defiant Ange Postecoglou believes Tottenham has enough to win trophies this campaign as he "always wins things in his second year".

Asked if he thought his team had enough to challenge for silverware this season, Postecoglou said: "I don't usually win things, I always win things in my second year," he told Sky Sports. "Nothing's changed. I don't say things unless I believe it."

Postecoglou has failed to beat Arsenal in three Premier League attempts and was left to lament his side's lack of a clinical edge after the match.

"It's very disappointing in a big game for us and our supporters. We didn't deliver so you have to take the pain from that," he added.

"It has been the story of our season so far, we played in their half and created chances, but we lack a bit of belief in the final third. That's what we need to fix. It was always going to be decided in moments, and they capitalised on theirs.

"It's me who has to give the guys the way forward. It's not for a lack of trying by the lads, we are just going through this early part of the season where we are playing well but not getting rewards for it.

"We handled set-pieces pretty well, but we switched off for one and paid the price."

Arteta, meanwhile, was beaming with the work rate put in by his side.

Arsenal had fewer shots than Spurs (seven to 15) but was more clinical than its host.

"They are a great side and create an unbelievable atmosphere," Arteta said of Spurs.

"We knew it would be tough. We believed we could hurt them, we weren't the best with the ball today.

"The way we defended was top drawer. We want to play a different game, but they put a structure that is extremely difficult to match up, so we decided not to do that."

"We had to work really hard, as you saw, we knew it was going to be a difficult game.

"On these days you have to work, and we know we can count on each other as team-mates.

"At the end, it paid off, and we are so happy that we won. We had key players missing, but we are a total team, the whole squad. We know that whoever comes on will be ready to help the team. We are really proud of the team."