Yeah they can, just need to attend if invited and have played 1 game in the WAFL comps (for example)
From the 2013 Draft App
form;
c.
If invited, the player must attend the
NAB AFL Draft Combine or other AFL-approved or
organised test or evaluation, unless the General
Manager, Football Operations considers that
there is a reasonable explanation for the player’s
non-attendance; and
d. The player has:
i. been previously registered with the AFL;
or
ii. been registered continuously from June 1,
immediately preceding the NAB AFL Draft
Selection Meeting and has
played at least one
game in the season immediately preceding
the NAB AFL Draft Selection Meeting in the
State League competition conducted by AFL
Victoria, the
WAFC, SANFL, the AFL (NSW/ACT)
Commission, AFL Canberra or AFL Queensland;
or
iii. been registered continuously from or before
June 1, immediately preceding the NAB AFL Draft
Selection Meeting with any recognised Club or
school competition in Victoria, Tasmania, New
South Wales, the Northern Territory, Queensland
or the Australian Capital Territory;