"What people often don't take on board about Fabrice is that is 21 years old; he is only a young lad," said the Welshman.
"Players progress at different rates. We saw Gary Cahill come in having not played a lot of Premier League games and take to it like a duck to water. He got into the side and, to the delight of everyone here, into the England set up this summer.
"Fabrice has played a lot of football in his young career and the manager has shown a great deal of faith in him. He has been allowed to make his own mistakes and gain experience.
"It's well documented, especially with younger players, that everything doesn't happen for them from day one when they move to a new club.
"It is usual to see them calm down in their second season and I think that will happen with Fabrice."