"The NFL won't discuss its arguments unless Clarett sued, league spokesman Greg Aiello said. Still, he defended the regulation.
"The draft is part of our collective bargaining agreement and the eligibility rule has been the subject of collective bargaining discussions," he said.
Asked Sunday if he thought, as a lawyer, that the NFL could win a lawsuit, Tagliabue replied: "My feeling as commissioner is that we have a very strong case and that we'll win it."