Sead Kolasinac is always looking to improve himself on the pitch.
The Bosnia & Herzegovina international has studied a whole host of players in his position ever since he started playing football as a young boy.
So who are the five left backs that he's modelled his game on?
"My No 1 is Roberto Carlos," Kolasinac said. "He was a dangerous left back and he played forward a lot too. He was probably the first left back who really stood out for me and has stuck in my mind.
"He started everyone shooting with the outside of boot.