The 204 cm, 119 kg lock played 63 Tests with the Wallabies, the national team of his adopted country of Australia.

[7] Vickerman was a replacement in all the domestic Wallaby tests in 2004, but became the starting lock on the end of year tour to the United Kingdom and France.

Although missing most of the 2007 Super 14 season through injury recovery,[6] Vickerman returned to the Test scene in a test match against Wales coming off the bench,[8] and cemented his place back in the Wallaby starting line up for the Wallabies 2007 Rugby World Cup squad.

[6] Vickerman raised his 50th Test cap against Wales during the 2007 World Cup, but managed just three appearances during the 2008 international because of another shoulder injury he sustained in the 2008 Super 14 final.

[6] In the autumn of 2008 Vickerman left Australia for England to study at Cambridge University, where he read Land Economy for three years.

[10] He signed a one-year deal in May 2009 to play with Northampton in the Guinness Premiership for the 2009–10 season,[10] but arranged to delay his arrival with the team until after the 2009 Varsity Match in December, in which he captained Cambridge to a 31–27 victory over eternal rival Oxford.

[13] He was chosen in the Wallabies team which won the 2011 Tri Nations Series and claimed third place at the 2011 Rugby World Cup.