David Luiz made a sensational deadline day move to Chelsea, and to many, it was a bad deal for the Blues.
Luiz was remembered for this erratic defending and extravagant style during his first spell at Stamford Bridge.
However, the Brazilian has been a key player for Chelsea in defence and has won over all his critics.
He told Sky Sports: “Have I matured? You have to, and also as a person.
“I think the experience gives you many things, and yes, as a person and a footballer, you have to if you want to learn. If you are open every day.
“I read more of the game now, I can understand more of the game, it is a different pressure now with the big games.
“Many, many things. I think if you want to improve, you need to think you are a better player than you were.
“I’ve worked with six, seven, eight coaches, they have improved my game, different leagues and different countries.”