Arsenal attacker Nicolas Pepe was criticised by Nice coach Lucien Favre on debut yesterday.
Favre handed loan signing Pepe a start in the 3-0 defeat.
He hasn't played for a long time in England. He has done the pre-season with Arsenal but he hasn't played any matches," he told Foot Mercato.
"He is lacking a bit of rhythm, intensity in his placements, in his pressing as well and in his ball recovery, because everyone has to do that. There aren't any exceptions. If one or two players don't do the work, the whole team is in trouble.
"Everyone has to do it at the same time, everyone has to defend to recover the ball."