The Brazil striker is back in the Blues squad after two impressive performances for his national team, as they head to south London to face Crystal Palace.
"On the pitch, I'm more mature, more experienced, with and without the ball," he said.
“I'm more calm, I understand the game more and I also understand our style of play better. My skills have improved since I arrived, I'm better with my left foot, with headers, with my position on the pitch.
“Off the pitch, I have always been very mature, very responsible. I have grown up as a person and I want to keep getting better and better.
“I have always been very attached to my family, but now I'm even more attached. So, I think I have improved in both areas, on and off the pitch."