From the team's press release:
Minneapolis/St. Paul – The Minnesota Timberwolves today announced the team has requested waivers on guards Devin Green and Mustafa Shakur. The preseason roster now stands at 14 players.
Green and Shakur both signed with the Wolves as free agents on Sept. 28, 2009. Green grabbed one rebound and blocked one shot in five minutes during his lone preseason appearance. Shakur saw action in two preseason games, averaging 2.5 points in 5.5 minutes.
An updated preseason roster is attached. (Updated Wolves Roster...pdf)