Per Jonathan Feigen of the Houston Chronicle, Harden announced Friday he wants to use the offseason "to prepare for changes with Rockets."
Per ESPN's Adrian Wojnarowski, Kyle Lowry hopes to be ready for camp with Team USA after having surgery to repair a tendon in his left thumb.
Harden was one of 20 players USA Basketball selected to attend training camp from Aug. 5-9. The final 12-man roster will be determined on Aug. 17 with the 2019 FIBA Basketball World Cup running from Aug. 31-Sept. 15 in China.
Harden won a gold medal with USA Basketball at the 2012 Olympics and led the team to a title at the 2014 FIBA Basketball World Cup.