The centre-back expects many more French stars to cross the Channel in the near future.
He told France Football: "French players are cheap compared to their English counterparts. Any English player on the fringes of the national team will cost £10m, even if he has not yet proved himself.
"That's the same Newcastle paid for four French players in January - guys developed to a high standard back home.
"But some French players have come to England, only to crash and burn inside a year or two.
"It is difficult to get a move to an English club, harder to make a name for yourself and even more difficult to stay there."