Major broadcasters have sought legal advice arguing the federal government has the power to ban wagering logos on sporting team jerseys and around stadiums, as the political fallout from anything less than a total ban grows.

Free TV, the lobby group that acts for Nine Entertainment, Seven West Media and Network Ten owner Paramount, has enlisted broadcast and competition law experts from Sydney firm Quay Law Partners after the government argued only the states had the power to ban ads on jerseys and on signs around football grounds.