AFC teams ain't going to like this ...
Chiefs legend Willie Roaf says the conference is going to have to deal with Patrick Mahomes for AT LEAST the next decade ... telling TMZ Sports the QB is going to be a star for the next 10-12 years!!
"Mahomes is like [Tom] Brady," Roaf says.
Of course, Roaf's prediction is horrible news for everyone not in Chiefs Kingdom ... because Mahomes is doing things in his second year as a starter that most QBs NEVER do.
The guy already has an MVP, he's heading to his first Super Bowl next week .