Platten was recruited to Carlton but after a protracted legal case eventually joined Hawthorn for the 1986 season. Keeping the number 44 on the back of his guernsey, he went on to play for the Hawks from 1986 to 1997, playing 258 games and kicking 228 goals. Nicknamed "The Rat" with his diminutive frame and unruly tangle of curly hair, he cut a distinctive if unlikely looking footballer, yet despite this he enjoyed a career which saw him firmly established as one of the best players of the 1980s and early '90s. He was a gutsy rover who won a Brownlow Medal in 1987, tying with Tony Lockett. He played in four VFL/AFL premierships with Hawthorn, in 1986, 1988, 1989 and 1991, and a State of Origin Carnival Championship for South Australia in 1988