Arguably the jewel in Leeds United's crown has been speaking ahead of his latest international commitment.
Cook’s breakthrough came last season when he quickly became a regular in the Leeds’ starting XI and ended the campaign with 38 appearances in all competitions.
This season things did not get off to the best possible start with the 18-year-old seeing red against Doncaster Rovers in the Capital One Cup and subsequently being suspended for three matches. But the teenager returned for the 2-1 victory against Derby County last weekend and he will play a vital role for Uwe Rosler’s side this season and beyond.
Such is Cook’s talent that it is easy to forget just how young he remains, but he believes he has grown up in double-quick time since making his Leeds debut last year.
"I had to adapt to that quite quickly and I think that has put me in good stead for this year; hopefully I can really push on now."
Leeds have a number of talented young players on their books, with Cook joined by the likes of Charlie Taylor, Alex Mowatt and Sam Byram, and if they continue to grow together there is no telling just how good the Whites will ultimately become.
Whatever happens, Cook has certainly grown up now and that bodes well for both club and country.