Pettigrew was drafted in the 2003 National Draft, as pick 46. He debuted in Round 1, 2004, against Essendon at AAMI Stadium. In 2007 he played every game for the year, and secured the solitary Brownlow Medal vote of his career.

2004-2009 Statistics:
Games: 90
Goals: 25
Average kicks: 6.23
Average handballs: 4.84
Average disposals: 11.08
Average marks: 3.52
Average tackles: 1.81
Total Brownlow votes: 1

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