Floyd Mayweather may not be WBC champ anymore ... but his face will forever be part of the organization's famous green championship belt, 'cause TMZ Sports has learned the undefeated fighter's portrait was permanently added to the strap.
WBC prez Mauricio Sulaiman tells us the World Boxing Council has permanently added Mayweather's portrait to every future belt ... joining Muhammad Ali.
The belt above is Tyson Fury's .