DeSagana Diop worked out for Chicago Saturday, but Krause and the Bulls didn't want anyone to know about it, writes K.C. Johnson of the Chicago Tribune.  A limousine driver who dropped off the 18-year-old Senegalese center and parked outside the Berto Center said he "was told not to talk" and then pulled behind the building to a players-only area to whisk Diop away.