[citation needed] Alagich then moved into the National Soccer League with West Adelaide SC, having already represented Australia at schoolboys and under-20 levels.

[6] South Melbourne finished first in the 1999 pre-season Tynan-Eyre Cup (held between Victorian NSL teams), but could not take part in the final of the tournament due to commitments to the 1999 Oceania Club Championship.

The cancellation of the NSL for 2004–05 meant that Alagich was forced to return to South Australian state football, and he played the 2004 season with the Adelaide Raiders.

When the A-League started in 2005–06, Alagich re-signed for Adelaide United, and played in 23 of their 24 matches as they won the inaugural Premiership and fell one game short of the Grand Final.

[16] 2006–07 saw Alagich play 21 games for United including the preliminary final at Hindmarsh Stadium against Newcastle Jets in which he scored in Adelaides penalty shootout win.