Despite taking the lead, Arsenal were beaten 2-1 by Watford on Saturday evening to put an end to their seven-game unbeaten run.
Captain Per Mertesacker headed the Gunners in front but late goals from Troy Deeney and Tom Cleverley completed an unlikely turnaround.
The 2-1 victory helped Marco Silva's Watford side leapfrog over Arsenal into 4th, whilst the Gunners dropped down to 6th.
Remarkably, Watford's only defeat in the Premier League this season was a 6-0 drubbing at home to Manchester City.
Speaking during the international break, Swiss midfielder Granit Xhaka spoke confidently following Arsenal's return to form.
Arsene Wenger's side were unbeaten since the 4-0 thrashing by Liverpool in August but the pressure will be right back on the veteran Frenchman once again.
"We are into our stride, and we have the top of the table back in our sights," said Xhaka.
"I am happy with things. I am a regular for one of the biggest clubs in Europe, and I want to progress still further.
"Getting straight back into the Champions League next season will be very important for us."
Xhaka assisted Mertesacker for the opener but Arsenal fans were fuming at his involvement in Watford's 92nd minute winner.
The defensive midfielder was made the scapegoat on a number of occasions earlier this season and fans on Twitter have singled him out once again.
Xhaka just stood and watched as Watford scored a dramatic late winner.
The days of Patrick Vieira bossing the midfield are long gone and Wenger must surely be questioning if Xhaka is worthy of a starting role.
Wenger was furious with the decision to award Watford a penalty.
"It was a scandalous decision, but what can we do? Nothing," said the French manager in his post-match interview.
"You can talk and talk but at the end of the day they scored.
"We had many situations when we could have scored the second and didn't.
"After that we were unlucky because the decision on the penalty is a bit ridiculous.
"Then we panicked a bit in the last seconds. We didn't need to give the ball away."