The Leeds United midfielder has lifted the lid on his new manager.
The former Brentford and Wigan Athletic boss took over from Neil Redfearn earlier this summer, and it seems he has quickly made an impact on the players he inherited.
Cook was arguably Leeds’ best player last season, appearing 38 times and quickly becoming an integral part of the team.
Few debut campaigns have gone better than the 18-year-old’s and having signed a new two-year contract he has a very bright future ahead of him, and yet he already knows not to get on the wrong side of his new manager.
“I get the impression he’s disciplined,” Cook told the YEP about his new boss. “You don’t really want to put a foot wrong, especially in pre-season when everyone’s battling for places. You want to make a good impression.
“But I like what he’s doing. It makes sense. He’s got everyone in gear and the mood is very positive.”
That will be music to the ears of Leeds fans hoping next season can bring plenty of success their way.
Leeds struggled for much of the previous campaign, although Redfearn ultimately guided them well clear of trouble with time to spare.
Cook’s performances were a huge part of that, and if he shows Rosler in training just what he is capable of, expect him to be a key component for the new man in charge of a club that could potentially be on the verge of the good times once again.