Oakland Raiders owner Al Davis has been pushing for coach Lane Kiffin to resign and is considering Dennis Green as a potential replacement, sources close to Kiffin and the team said.

Davis has gone so far as to draft a letter of resignation for Kiffin to sign, a source said. Kiffin has refused to do so but has dared Davis to fire him instead. The letter, the source said, was sent to Kiffin two weeks ago.