Granit Xhaka’s second-half goal secured Arsenal a 1-0 win over PSV Eindhoven at the Emirates Stadium and a place in the Europa League knockout stages on Thursday.
Mikel Arteta’s side took a five-point lead over PSV at the top of Group A in a rescheduled game that was postponed last month following the death of Queen Elizabeth II.
The two teams will meet again within a week, when one point for Arsenal would be enough to guarantee first place and qualify directly for the round of 16.
“I’m very happy to score. I don’t know when I last scored on the right foot, but very happy,” Xhaka told BT Sport.
“It doesn’t matter which foot, or who scores. It gives us confidence and we go on to the next one.”
A fourth win in as many games in Europe means Arsenal have won 13 of their 14 games in all competitions this season.
“Everything is going well at the moment, but for us it’s not a surprise, we’re doing a lot of work,” Xhaka added.
“We have won and lost as a team and at the moment we are very dangerous. We wanted to pass and we are very happy.”
The Premier League leaders dominated for long periods but had to wait until 19 minutes to go to take the lead when Takehiro Tomiyasu returned the ball for Xhaka to score his third goal of the season.
Bukayo Saka and Gabriel Martinelli came close to extending their lead towards the end, but Ruud van Nistelrooy’s PSV rarely threatened to equalize.
Arsenal, who are four points clear of reigning champions Manchester City, return to Premier League action on Sunday with a visit to Southampton.