Dirk Nowitzki and his agent, Holger Geschwindner, have yet to be contacted by the Mavs regarding an extension, despite numerous assertions by Mark Cuban that one would be offered before the 10/31 deadline, reports Dwain Price of the Dallas Star Telegram.  Cuban has said that he will offer the maximum salary in an extension that he can, which would be between $90 and $95 million.  Mr. Geschwindner is concerned that a deal won't get done before the deadline.