Tom Brady's days as the greatest quarterback in NFL history could be numbered.
The league's only seven-time Super Bowl champion has a comfortable lead over just about every other player in that category. Yes, Hall of Famer Charles Haley got five rings with the San Francisco 49ers and Dallas Cowboys, but he's been retired since 1999 and the feared pass rusher never played quarterback.
However, according to one of Brady's former New England Patriots teammates, there is one signal caller with a chance to rival Tom's perceived status as the 'greatest of all time': 29-year-old Kansas City Chiefs legend Patrick Mahomes.