Wenger highlighted the contrast between the 30-year-old's assured performance against Germany and his lacklustre display in France's 2-0 loss to England on Tuesday as proof the former Lorient man had been affected by the attacks.
"I have not spoken to him yet but I will talk with him (before the weekend) to see if he is recovered and focussed," Wenger told reporters at a news conference
"He had a fantastic game against Germany and you could see he was not himself on Tuesday. It affected him deeply. I did not recognise the player I saw on Tuesday night.
"I will look how deeply they are affected. Sometimes it hits you more two or three days later than on the night. Then, you try and protect yourself, or you do not know what is going on."
The French coach also said he will hold talks with striker Olivier Giroud, who scored against Germany, to see if he was still traumatised by last week's attacks.
"Slowly, you realise the shock comes a bit later. They (Koscielny and Giroud) have gone through that game, but I will talk to them and see how much they are up for it," Wenger said.
(Reporting by Shravanth Vijayakumar in Bengaluru; Editing by John O'Brien)
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