Arsenal's assistant coach Steve Bould said his side's 2-1 win at Montpellier represented a promising start to a daunting run of fixtures.
First-half goals from Lukas Podolski and Gervinho enabled Arsenal to fight back after Younes Belhanda gave Montpellier an early lead at Stade de la Mosson, leaving the Londoners level on points with Schalke at the top of group B.
After previous wins over Liverpool and Southampton, Arsenal now have three consecutive victories behind them, but the sequence of games from now into October could determine their aims for the rest of the season.
Arsenal visit English champions Manchester City on Sunday and host European champions Chelsea on September 29, before returning to Champions League duty with a home game against Olympiakos on October 3.
Bould, who was deputising for the suspended Arsene Wenger in Montpellier, said that the way the visitors withstood a second-half surge from their hosts augured well for the forthcoming showdown with City.
"We'll go in there with a bit of confidence, and people have the belief that things are going well," he said. "It'll be a proper test, but it's where we want to be and hopefully we'll come out the other side and say that we've done well again.
"We've had a decent start to the season. This keeps the run going, and not just for the Champions League. We've got some tough games coming up.
"We've got great spirit and that was evident tonight."
"You can't be happy when you lose but there were lots of satisfactions. I think it could be a launchpad for our season," said Montpellier coach Rene Girard.
Elsewhere in the group, Schalke beat Olympiacos 2-1.