The Montreal Canadiens drafted Josh Brook in the second round of the 2017 NHL Draft. He was coming off a solid 17-year-old season as a defenceman in the Western Hockey League. Brook scored eight goals and 40 points in 69 games. He stepped up in the postseason as well scoring seven points in seven games.
Brook had played well enough in his first two seasons with the Moose Jaw Warriors to be asked to represent Canada on the international stage twice. He suited up at the Under-17 during his rookie campaign and scored three goals in six games.