"I have grown immensely since I've been here," the 25 year old told Goal.com.
"I have become stronger here in every way. Every year, I've felt like I've taken more on and become better, more complete and mentally prepared - not only with football but life in general.
"I have never wanted to settle because I know that improvement is something that doesn't stop. There are always new things you can pick up and many ways to develop. I'm happy with how much I've grown, but I'm not finished yet.
"When I arrived, I had only been seen or thought of as a playmaker. But I've had the opportunity to work with top professionals, real quality players, and under good managers, which has helped me understand the responsibilities of different positions and what each one requires.
"I am used to and confident now in many areas of the pitch and it has made me more rounded. I don't just attack better, I defend better too."