The post does not mention the nature of the injury--SB Nation DC editor Mike Prada speculates it could be related to a thigh contusion--but it does say Booker has returned to the United States to rehab it. In addition, the club has signed J.J Hickson of the Sacramento Kings to replace Booker on the roster. In light of his returning to the U.S., and his team's move to sign another NBA player, it seems as though whatever ails Booker is pretty severe. If and when more news on his condition becomes available, we'll pass it along.
As a rookie, the Clemson product averaged 5.3 points and 3.9 rebounds for Washington, shooting 54.9 percent from the field. He started 14 times in 65 appearances. The Minnesota Timberwolves made Booker the 23rd overall pick of the 2010 NBA Draft, then traded his draft rights and Hamady N'Diaye to the Wizards for the draft rights to Lazar Hayward and Nemanja Bjelica.