Top NFL TV voices out of contract after current season

Variety reported ESPN's Joe Buck and Troy Aikman, Fox's Greg Olsen and Amazon's Kirk Herbstreit will see contracts expire after the current NFL season. Buck and Aikman call “Monday Night Football”, Olsen works Fox Sunday afternoons, Herbstreit calls “Thursday Night Football”. Al Michaels, Herbstreit’s Amazon partner, is on a year-to-year deal, Variety said.