42-year-old Oscar has been flirting with the idea of returning to the ring ... and told TMZ Sports he wants to fight Triple G -- the most dangerous man in all of boxing.
So, when Prime Time appeared on "The Cruz Show" on Power 106 this morning ... he had a STRONG message for the Golden Boy -- FORGET ABOUT IT!!!!!!
"Oscar, I love you. You're a hero. Don't do it," Sanders said ... "You can't come back when your head is the target."