LAS VEGAS, Nevada: Unbeaten US star Floyd Mayweather Jnr declared himself fit to fight after a rib injury delayed his comeback but says money demands have foiled a possible showdown with Manny Pacquiao.

Mayweather dismissed Pacquiao's claim to the world pound-for-pound throne Mayweather vacated by retiring in December of 2007, saying, "It's like a T-Bone steak. After I eat all the meat off the steak, they throw him the bone."

Mayweather, 39-0 with 25 knockouts, will fight Mexico's Juan Manuel Marquez, 50-4 with one draw and 37 knockouts, on September 19 after this Saturday's planned date was scrapped over an injury whose origin Mayweather kept secret.