A tall marking forward, Thompson was an important young player for the club considering he was selected in the 1997 AFL Draft at pick 82.

Playing mostly at Full Forward with the occasional run in the ruck, Thompson was the club's leading goalkicker for seasons 2003 and 2004.

With the Roos trailing by almost 4 goals late in the 4th quarter, Thompson was part of a revival where the Kangaroos managed to take the lead in the dying moments.

However following a desperate last-quarter chase of Melbourne's Nathan Carroll, Thompson in a shock move put himself on the bench, replacing himself with Drew Petrie.

Thompson later cited that he was "spent" and tired as the reasons for his early exit (Melbourne then went on to win the game with a last minute goal after the Kangaroos had several forward opportunities).

In Round 6 Thompson said that he was willing to put the previous week's debacle aside and performed with an 8-goal haul, the best of his career, to give the Kangaroos a 22-point victory to lift them off the bottom of the ladder.

He kicked a Super Goal against Carlton in the Semi-Finals of the NAB Cup, then, a week later against St Kilda in a Practice Match, Thompson ruptured his ACL and missed the entire 2007 Season.

In addition, on returning from a commercial break, Carey was clearly heard to make references to 'necking himself', to the apparent delight of other members of the Footy Show panel.

He also missed out on the finals with coach Laidley saying that he wouldn't risk changing the team's structure that had led to the success they had enjoyed over the season.