The Gunners found themselves behind after just 19 seconds at the Britannia Stadium as Peter Crouch took advantage of some sloppy defending to prod home, before Bojan Krkic and Jonathan Walters made it 3-0 before half-time.
Wenger’s men did, however, manage to get themselves back within a goal as Santi Cazorla fired home from the penalty spot before Aaron Ramsey rifled a volley into the back of the net, but Calum Chambers’ late sending off took the wind out the side’s sails, allowing the Potters to see out the win.
“They were sharper than us and we were not dominant enough in the challenges and looked a bit tender at the back,” Wenger told Sky Sports.
“We responded very well but it was difficult to come back and we gave absolutely everything.
“When you look in the last two weeks for what this team has given, you have to respect the level of energy we put into the game.
“We were too fragile (at the back). We missed (Laurent) Koscielny and it was too much.
“I think we were unlucky first of all to get the player sent-off. I don’t know what the referee has seen for the second yellow card and overall we had a few situations where we were very, very close.
“We did not do what we promised ourselves from the start of the game and that’s something that makes you angry.”