Sorry, Patriots fans ... Quinnen Williams says Bill Belichick is NOT the greatest football coach ever -- the Jets star tells TMZ Sports that honor now belongs to Nick Saban!!
The NFL defensive lineman made the bold claim shortly after the Alabama head coach won yet ANOTHER National Championship this week ... saying, "I think, in my head, I think he's the greatest coach of all time."
"Just because, man, like, his resume speaks for itself, man," Williams said.
Of course, Williams is biased -- the dude played for Saban for three years with the Tide from 2016-2018 -- but it's getting harder and harder to disagree.
Saban's victory over Ohio State last Monday gave him his SEVENTH college football championship -- the most in the history of the game.
The 69-year-old also has a staggering college coaching career record of 261-65-1 ... and has routinely put players in the NFL year after year after year.
"He has a list of hundreds of NFL players who are either starters or big-time superstars or big-time players under his belt," Williams says. "To do the things that he does, and to have a consistent dynasty and a consistent winning team that he has, it's unheard of."
As for the Saban vs. Belichick G.O.A.T. debate ... Williams says he respects the hell of The Hoodie -- but he just believes Saban should get the nod for the honor now.