MANILA (REUTERS) - Manny Pacquiao said on Wednesday (Aug 11) that Cuban Yordenis Ugas, who agreed to put his WBA welterweight championship belt on the line against the Filipino southpaw on short notice, is not to be underestimated.

Pacquiao was preparing to fight WBC and IBF welterweight champion Errol Spence Jr on Aug 21 in Las Vegas but a retinal tear forced the American to withdrawand on Tuesday Ugas was announced as Pacquiao's new opponent.