10:15pm: Broderick Turner of the Los Angeles Times reports that the injury is a meniscal tear that will require arthroscopic surgery.
9:15pm: Yahoo's Marc J. Spears says that although Blake is done with the Olympics, he should be ready for training camp (Twitter link).
4:32pm: Adrian Wojnarowski of Yahoo Sports tweeted earlier that Blake Griffin hurt his knee during a scrimmage with Team USA and will return to Los Angeles for further examination by team doctors. Just yesterday, Griffin signed a five-year maximum extension to remain with the Clippers.
Team USA officials have summoned Anthony Davis back to Las Vegas immediately to fill in as Griffin's replacement, according to Wojnarowski (via Twitter).