"I think they had a difficulty with the Anelka problem and they made the wrong decision when they refused to practice. That is not acceptable," Wenger told arsenal.com.
"That created a huge turmoil in France and that is basically it."
France's passage to the World Cup was also tainted with controversy after Thierry Henry's infamous handball against the Republic of Ireland. But Wenger does not accept that Les Bleus are still mentally affected by what happened in that November play-off.
"I don't think their problems are linked with that," he said. "I think it's linked with the fact that there is no unity in the group, no unity between the manager and the players within the group.
"But even more than that there is not enough quality in the team."