The heat has been put on North Melbourne's Todd Goldstein to regain the sense of purpose that made him All-Australian ruckman in 2015.

Kangaroos coach Brad Scott revealed he had some frank discussions with Goldstein after the ruckman lowered his colours to Melbourne's Max Gawn on Saturday, when the Demons' big man dominated centre bounces.

Goldstein was well-beaten by Gawn on the weekend. Credit:AAP

The main message to Goldstein was to concentrate on maximising his strengths around the ground, outrunning his opponents and pushing forward when the opportunity arose.

Scott wants Goldstein to adopt a positive mindset so he can once again be regarded as one of the game's best big men.