[1] Gilham's junior career was distinguished, playing for Oakleigh Chargers in the TAC Cup and in 2002 he was chosen to captain the Victoria Metro under 18 side in the national carnival.
Gilham's three seasons at Port Adelaide were hampered by groin and shoulder injuries, together with difficulty gaining the strength to succeed as a key defender in the AFL.
Gilham spent most of 2006 playing for Hawthorn's VFL affiliate team, Box Hill, before eventually earning an opportunity in the senior side in the round 19 match against Carlton.
In recognition of his improvement in both game play and muscle mass, Gilham was promoted to Hawthorn's senior list for season 2007.
After fellow key defender Trent Croad was forced from the field with a broken foot early in the second quarter, Gilham's presence provided vital stability on the last line, helping the team to claim the 2008 AFL premiership.