"This is what everyone expected him to do," he said of Leach. "We're confident the Supreme Court will agree with Tech that he doesn't have a legal course of action."
Texas Tech attorneys have argued that the university is a state entity with sovereign immunity, meaning it can only be sued with permission from the state Legislature or a waiver based on a defendant's conduct.
In January, Leach hired an Austin consulting firm to work on getting Texas legislation passed that could allow the former coach to sue the university, another of Leach's attorneys, Paul Dobrowski, said Friday.
In a separate case, Leach has also sued ESPN Inc. and a Dallas public relations firm, accusing them of libel and slander after he was fired. The lawsuit seeks undisclosed damages and retractions from ESPN and the PR firm.