The Gunners have only impressed fits and starts this season, with an inconsistency in performances leaving them fifth in the standings.
That was epitomised last night as a number of recent impressive results were followed up by a poor display at Southampton, where they were lucky to secure a point.
Wenger was angered by his players' lack of mental sharpness and admits he is looking to strengthen this month.
"I will be active, yes," the Frenchman said. "Will I be concrete? I hope so. We are looking everywhere, we are open-minded.
"We want to strengthen the squad if possible if we find the right players."