Michael Irvin Says Belichick's The GOAT

Cowboys HOFer Michael Irvin is doubling down on his promise to replace Vince Lombardi's name with Bill Belichick's on his Super Bowl trophies ... sayin' B.B.'s simply the best.

TMZ Sports ran into Irvin at LAX, and not only did he confirm he's serious about his shocking comment, he explained why Belichick is a BETTER COACH than Lombardi.

ICYMI, Irvin hit up Twitter Wednesday and said if the Pats won on Thursday, he'd swap Lombardi's name with B.B.'s on his Lombardi Trophies.

FYI -- Michael won 3 Super Bowls.

Sounds crazy ... but he seems serious.

Check out the clip, and see for yourself!