A federal appeals court has ruled that Tom Brady must serve a four-game Deflategate suspension imposed by the NFL, overturning a lower judge and siding with the league in a battle with the players union.

"We hold that the Commissioner properly exercised his broad discretion under the collective bargaining agreement and that his procedural rulings were properly grounded in that agreement and did not deprive Brady of fundamental fairness," the 2nd U.S. Circuit Court of Appeals ruled Monday in New York.

The decision by a three-judge panel may end the legal debate over the scandal that led to months of football fans arguing over air pressure and the reputation of one of the league's top teams. It is also likely to fuel a fresh round of debate over what role, if any, the quarterback and top NFL star played in using underinflated footballs in the AFC Championship Game in January 2015.