Ben Simmons will not participate in the Tokyo Olympics. for Australia 

Brian Goorjian said in a statement that he and Team Australia "understand and support his decision."

"The best thing for everybody right now is for him to go on and develop that skill package and improve in a couple of areas for his next season in the NBA, but the Boomers are always here for him. We wanted him to know that in his time of need, the culture and the guys here are behind him and support him," Goorjian said.

Simmons heads into an uncertain offseason following the Philadelphia 76ers' second round exit.  

RJ Barrett, Andrew Wiggins, and Lu Dort headlined Canada's 12-player roster for the upcoming Olympic Qualifying Tournament.

The six-team tournament begins on Tuesday, June 29, with teams battling for one Olympic spot.

Other teams include Turkey, Greece, China, Czech Republic, and Uruguay.

Canada are coached by Nick Nurse.

Canada's complete roster can be viewed here. 

Khris Middleton and Jrue Holiday said that they remain focused on the Milwaukee Bucks playoff run despite accepting invites to play in the Tokyo Olympics. 

"We're in the middle of a championship run," said Middleton. "To take a second to think about something outside of this season, it was a little tough to think about it. But it was an easy decision for me to go ahead and commit."

The U.S. team is planning to arrive in Tokyo on July 21, with the first game starting on July 25.

If necessary, Game 7 of the NBA Finals would take place on July 22.

"I think I'm always focused on the immediate, what's happening right now. That's been my main focus, and it's going to continue to be that," added Holiday. "If we go the Finals or whatever happens, up until that point, this is what matters."

Monte Morris and OG Anunoby are two of 13 NBA players named to Nigeria's preliminary roster for the upcoming Olympics.

Nigeria, led by Mike Brown, begin training camp on June 20.

Eight current or former NBA players are set to make their debut for Nigeria, including Jahlil Okafor, Udoka Azubuike, KZ Okpala and Precious Achiuwa.

"I could go on and on in naming the contributions that each guy is bringing to the table for their teams, which is exciting for me, and it should be exciting for all of Nigeria, with the impact that they're having in the NBA, because they are the future of the program," said Brown. 

Anthony Edwards will join USA Basketball's select team in Las Vegas, sources told Adrian Wojnarowski of ESPN.

The select team will practice and scrimmage against Team USA in July as part of the preparations for the Tokyo Olympics.

The full select roster will be finalized soon.

Erik Spoelstra will coach the select team. 

Zach LaVine and Jerami Grant have committed to the United States for the Tokyo Olympics to complete their 12-man roster.

James Harden has withdrawn as he recovers from a hamstring injury.

The United States has also received commitments from Kevin Durant, Damian Lillard, Draymond Green, Bradley Beal, Jayson Tatum, Devin Booker, Kevin Love, Bam Adebayo, Jrue Holiday and Khris Middleton. 

The United States have received two additional commitments for their Tokyo Olympics roster.

According to ESPN's Adrian Wojnarowski, the United States received commitments on Tuesday from Khris Middleton and Kevin Love. Love was a member of the 2012 team.

Chris Paul has declined an invitation after previous reported indicated he intended to commit. 

Ben Simmons is doubtful to play for Australia at the Tokyo Olympics, sources told Brian Windhorst of ESPN.

Simmons plans to spend the offseason working on skill development.

Australia is scheduled to begin training in Los Angeles this week. 

Stephen Curry has decided not to participate in the Tokyo Olympics.

Curry had been trying to decide whether or not to play for the United States over the past few weeks. Curry has not played in the Olympics during his career.

James Harden has committed to play for the United States in the Tokyo Olympics. 

Harden played in the 2012 Olympics and 2014 FIBA World Cup.

Kyrie Irving, however, is unlikely to play as he recovers from his ankle injury suffered in Game 4 of the Eastern Conference Semifinals. Irving last played for the United States in the 2016 Olympics.