Just saw this on Rotoworld.
Michael Bush-RB-Raiders Nov. 21 - 7:34 pm et
Raiders kept RB Michael Bush (leg surgery) on the Physically Unable to Perform list, ending his season.
Bush can still practice with the scout team and attend meetings. This move was more a result of Oakland not wanting K.C. to get its mits on LaMont Jordan, as Jordan likely would've been the one to go had Bush been activated. Coach Lane Kiffin confirmed Bush was healthy enough to contribute if needed and expects him to compete to start next season.
Source: Oakland Tribune