Cuban says he 'll never trade Dirk Dirk Nowitzki has spent his entire 15 - year career as a member of the Dallas Mavericks .
If Cuban Cuban   has his way , Nowitzki will never don another team 's uniform .
Cuban says he 'll never trade Dirk Dirk Nowitzki has spent his entire 15 - year career as a member of the Dallas Mavericks , and if owner Mark Cuban has his way , Nowitzki will never don another team 's uniform .