Wenger revealed after Sunday afternoon's 3-2 FA Cup win over Aston Villa it could be only a minor setback.
"We have no real news yet. The first news we have had is better than expected. He is not in a boot, but I don't know more," said the Arsenal boss.
"His morale looks quite good and I hope it will only be a short setback. There will be more tests this week."
Wenger added: "I do not know yet when he will start training. I would not like to make any mistake in my statement because I did not speak to the medical people today."