Sir Alex Ferguson admits he is surprised Patrice Evra has been left out of the France squad.
Evra was involved in a turbulent World Cup that saw the French team fall victim to infighting.
The Manchester United player was slapped with a five-match ban for his part in a training ground protest following the sending home of Nicolas Anelka.
Despite having now served his ban, French coach Laurent Blanc has still opted to omit Evra from his squad, meaning the 29-year-old will sit out the friendly against Brazil on Wednesday.
According to Evra's United manager Ferguson, the matter should have been resolved and the player reinstated at left-back.
"It is surprising he has been left out because he has been punished. I don't see why he should be punished further," he said.
"If they are saying he is not good enough to play for France then you cannot argue with that. But I know he is the best left-back France have got and one of the best in the world.
"There is no question in my mind about that. He is a fantastic footballer. He will be disappointed but he just has to accept it."
Current French boss Blanc finished his playing career at Old Trafford at the wishes of Ferguson, yet has baffled his former manager with his decision over Evra.
Ferguson added: "Patrice Evra is a very important player for Manchester United and he will continue that way.
"Laurent Blanc was a player here and he knows the expectation at this club.
"He knows that any player coming from Manchester United is playing at the highest level and he knows that about Patrice.
"He has served his punishment. He had five games and I thought they would have moved on."