"He is always questioning himself, knows what he did well and what he did wrong," the defender said. "Olivier tries to work on it during training sessions and tries to communicate with the boss, is always asking about his positioning, what he could do more.
"He is a very good player, good physically in front of the goal and finishes well. We need to give him time and I think he will improve even more, and be more decisive."
Sagna will be out of contract in the summer and will be free to talk to other clubs about a potential move in January, but Wenger remained tight-lipped about an extension.
"We are always talking about it," Wenger said. "When the situation has developed, we will inform you. And there again, I do not think today is the best day to talk."
Edited by Michael Beattie