He was picked by the Kangaroos with their first pick, the ninth overall in the 2003 AFL draft.
Trotter made his debut against Port Adelaide in Round 18, 2005 at Manuka Oval. In this tight game, he almost kicked the winning goal. He played the following week against Collingwood.
Trotter was delisted by North Melbourne in October 2007, after playing just the seven games in four years on the Kangaroos' list. He played 46 games and kicked 18 goals in the SANFL with Norwood, making his debut on 21 April 2008, where he was named Norwood's best player on the night. His last game was against Central Districts in the 2010 losing Grand Final.
In August 2011, Trotter joined specialist financial recruitment firm Halliday Marx, based in London, as their International Candidate Manager. In 2013 he joined his former manager Alex McDonald as a player manager in his Hemisphere sports and talent management company.[2]