Keisuke Honda's goal was the difference between the sides on Monday and leaves Paul Le Guen's men with an uphill struggle to reach the last 16.
But Lyon midfielder Makoun believes the Indomitable Lions can put things right in their next game against Denmark.
"We lost a game but we must not let our heads drop, we will discuss what happened and correct some things," he said. "We especially need to make a better start to the match against Denmark. We do have an obstacle to overcome but fortunately we are playing another team who lost their opening match."