Investigators seized 16 sites and brought criminal charges against a Michigan man who controlled nine of them.

U.S. Attorney Preet Bharara warned sports fans in a release that piracy costs sports leagues and broadcasters millions of dollars, forcing increases in ticket prices and other costs to consumers.

His message came soon after Brady casually mentioned his own use of illegal websites during a news conference staged in preparation for the Super Bowl on Sunday between the New England Patriots and the New York Giants.

"Last year I was rehabbing my foot in Costa Rica, watching the game on an illegal Super Bowl website. And now I'm actually playing in the game. So, it's pretty cool," said Brady.

Web operator Yonjo Quiroa, of Comstock Park, Michigan, was charged Wednesday with copyright infringement. Prosecutors said he distributed football, basketball and hockey games and wrestling matches.