France coach Didier Deschamps admitted he was surprised by Cameroon's performance after the Euro 2016 hosts snatched victory.
Deschamps and Co. prevailed 3-2 thanks to Dimitri Payet's 90th-minute free-kick in Monday's international friendly.
Payet's winner came just two minutes after Cameroon equalised via Eric Maxim Choupo-Moting.
"There have been problems because the opponent has qualities," Deschamps said.
"They have not thought to defend. There are things we can do better, of course.
"For some it is a long time without competition. We will look at what to fix.
"I was surprised by this team because I watched a lot of their recent games. I found them much better than in their last matches I've seen."
France hit the front in Nantes thanks to Blaise Matuidi's 20th-minute volley, but Vincent Aboubakar levelled proceedings two minutes later as Cameroon threatened on the counter-attack.
Cameroon hit back again, this time capitalising on an error in France's defence in the 88th minute as they seemingly earned a draw until Payet's stunning winner.
"We can always improve everything. This is the first game that Adil [Rami] played with Laurent [Koscielny]," Deschamps added.
"We had more quality and that's why we have not done everything right.
"On the defensive side, not everything was perfect and it deserves more communication."
