The Under 23s side take on North Korea in Newcastle on Saturday followed by Lebanon on Wednesday in their bid to qualify for the 2008 Olympics.

But despite being named in the squad, FC Nurnberg starlets Vidosic and Spiranovic have failed to show up for the training camp at Terrigal.

They pulled out at the last moment with late injuries - Vidosic is said to have a bruised foot and Spiranovic a "virus".

But it is believed they were withdrawn after pressure from their club, despite only appearing on the bench for the Bundesliga side.

Newcastle United star James Troisi - who scored for the reserves last week and was on target again in another reserve match last night - is still serving an unofficial ban.

He missed an Olyroos camp earlier in the year for the Jordan game and the FFA have refused to select him until they have probed the reasons behind his non-appearance.

FFA CEO Ben Buckley said Australia were looking at the possibility of complaining to FIFA over Vidosic and Spiranovic's no-show.

They could have the players banned from turning out for their next club match - but as they are usually bench-warming, the effect would be limited.

"Most clubs don't have an issue releasing players for the national team but maybe there are some countries in Europe who don't see the Olympics as very important," Buckley told the Sydney Morning Herald.

"It's an issue which is currently being investigated and I'm expecting a report within the next 24 hours as to why the players did not make camp."

He added: "But the problem with the system is that in this case, if you invoke the right to suspend a player, you aren't necessarily taking action directly against the club … if the player is a fringe player, then who's being penalised? For the club, is there any material effect?"