The four Australian under-23 players being investigated following an incident in Cambodia have all missed selection for the Olyroos' upcoming friendly tournament in China.

While Adelaide young gun Al Hassan Toure has, as expected, been named, his A-League teammate and Olyroos captain Riley McGree is a notable absentee.

McGree, Lachlan Wales, Nathaniel Atkinson and Brandon Wilson have all been asked to "show cause" to the FFA for their alleged behaviour following a qualifying tournament for next year's Olympics in Phnom Penh at the end of March.

Wales, Atkinson and Wilson are also absent from the 25-player squad named on Monday to face North Korea, China and Lithuania's under-23 teams in the three friendlies from November 15.

Toure's selection was confirmed last week by national team coach Graham Arnold and indicates Australia is winning the race for the teenager's services.

The 19-year-old, who has shot to prominence in the FFA Cup and A-League this season, could also play for Liberia, the country where his parents were born.

Arnold has resisted the urge to fast track Toure into the Socceroos squad in a bid to tie him down to Australia long-term but said he's happy and excited to have the striker as part of his plans ahead of January's Olympic qualifiers in Thailand.

"The conversation I had with Toure was just around what's next," Arnold said last week.

"What's next is the Olympic campaign and does he want to be a part of it. He assured me 100 per cent he does."

Another notable absentee from the squad is Socceroo Daniel Arzani, who will remain at Scottish club Celtic during the international break.

The team will be led by interim coach Gary Van Egmond in China although Arnold will travel to link up with the team following Australia's World Cup qualifier in Jordan later this week.

Australia face Thailand, Iraq and Bahrain in their group at the Asian under-23 championships in January, which also double as a qualifier for the 2020 Tokyo Olympics.

Only three nations will qualify for the Games along with host nation Japan.

Australia last competed in an Olympic football tournament in Beijing in 2008.

OLYROOS SQUAD: Panos Armenakas, Keanu Baccus, Daniel Bouman, Jake Brimmer, Gabriel Cleur, Thomas Deng, Zach Duncan, Ben Folami, Alex Gersbach, Thomas Glover, Kosta Grozos, Jordan Holmes, Jacob Italiano, Anthony Kalik, Josh Laws, Daniel Margush, Connor Metcalfe, Tas Mourdoukoutas, Ramy Najjarine, Connor O'Toole, Nick Pennington, Reno Piscopo, Dylan Ryan, Al Hassan Toure, Harry Van Der Sag.