By Ramona Shelburne Los Angeles Clippers forward Blake Griffin has let team officials know that he intends to sign a five-year contract extension this month, sources with knowledge of the situation told ESPNLosAngeles.com on Saturday. Griffin can not officially sign the extension until July 11, but negotiations between the team and his representatives are not expected to turn into a drawn-out process, sources said, as no player coming off a rookie-scale contract who is eligible and was offered the maximum contract extension has passed on it.