Steven kicked the final goal of the 2008 NAB Cup quarter final – a competition which St Kilda went on to win, although Steven did not play in the final.
Steven made his AFL debut in Round 19 of the 2009 AFL season in the Saints' upset win over Hawthorn at York Park in Launceston, Tasmania when the then undefeated Saints were without seven of their best player due to injuries. It was his only AFL game for the year, but he played eight more in 2010.
In January 2011, Steven, along with three teammates, was suspended for six weeks and fined after breaking team rules involving alcohol, prescription medicine and leaving the team hotel while on a team camp in New Zealand.
During 2013 Steven established himself as one of the AFL's most elite emerging young midfielders. His explosive pace and ferociousness at the contest culminated in a career best season in which he won the 2013 Trevor Barker Award for St Kilda's best and fairest player.