The Wizards veteran's application for dual citizenship will not be processed in time to represent his mother's home country.
The Wizards point guard will hit China, South Korea and Japan.
Wizards forwards earned first-team recognition at the Las Vegas summer league last month
The Wizards' starting power forward shoots 4 for 7 from the floor in 19 minutes.
The rugged forward-center joins a crowded front court after finding fun in basketball again in the playoffs with the Mavericks last season.
After a successful 2013-14 season, visibility will increase this coming year, with 10 appearances on national television, including Christmas Day against the Knicks.
Humphries credits his only season with the Celtics for improved efficiency.
Washington will be featured on the league's marquee regular season date for the first time since 2008, a sign of its rising profile.
The Wizards open their preseason against the Bulls on Oct. 6.
Harrington was option to fill out the Wizards' roster, but decides to go overseas