Roach told a press conference that at 38-years-old Mayweather could be the perfect target for Pacquiao to hit and added that the American's vaunted defensive abilities are waning.
"His legs are a little bit shot. He's slowed down quite a bit," Roach said.
"He is going to have to exchange more," he added.
The trainer laughed off suggestions that Maywether was fighting more toe-to-toe nowadays in an effort to please fans.
"He doesn't care about the fans. He has to exchange more because his legs won't take him out of the way…
“If he has to exchange with Manny Pacquiao he is in trouble," Roach added.