Assuming Graham Arnold selects the full complement of 3 over-age players in his 18-strong squad for the Olympics, there're only 15 spots up for grabs for the current U-23s.
Speculation over the 3 hasn't exactly been rife, but Kewell, Schwarzer and Holman have been mentioned as likely candidates. Each may be with a new club and hence will have a strong reason not to go. Bresciano, Sterjovski, Culina, North, Joel Griffiths, Vargas, Covic could just as easily be among Arnold's thoughts.
Assuming he takes an over-age goalkeeper, defender and striker, here's the 15 I would select to join them:
Velaphi - backup; only 2 goalies needed in a squad of 18
Topor-Stanley - probably a touch more versatile than McClenahan
N. Burns - has to go, surely
Ward - over Kilkenny and Sarkies
Broxham - one of the few mids who can perform fullback duties in a pinch