Whitmore was assigned to the Rockets' G League affiliate Thursday, Jonathan Feigen of the Houston Chronicle reports.
Whitmore has bounced between the Rio Grande Valley Vipers and the Rockets this season while recovering from a lingering knee issue. However, when the Rockets are at full health the second-year forward is not likely to play a significant role in the rotation, and he has averaged 5.9 points and 1.4 rebounds across only 9.9 minutes per game over eight regular-season outings.