By Miguel Rivera

Trainer Freddie Roach is very confident that his star fighter, Manny Pacquiao (59-6-2, 38KOs), is capable of beating WBO junior middleweight champion Saul 'Canelo' Alvarez (48-1-1, 34KOs).

Pacquiao re-captured the WBO's world title at the welterweight limit of 147-pounds on Saturday night, when he dominated Jessie Vargas at the Thomas & Mack Center.

Roach wants Pacquiao to secure a rematch with Floyd Mayweather Jr. If they are unable to get Mayweather in the ring, then he views Canelo as the next best option.

Pacquiao is a former junior middleweight champion, but his 2010 clash with Antonio Margarito took place at catch-weight of 150-pounds.

At first glance, Roach believed Canelo was too big. But after watching how Amir Khan handled himself against Canelo before getting knocked out in the sixth round, Roach became convinced that Canelo was a winnable fight for Pacquiao. Khan moved up to face Canelo at a catch-weight of 155-pounds.

The only stipulation Roach would demand is a rehydration clause to cap how much weight Canelo was able to pack on after the weigh-in.

"I think Manny can outbox him. Obviously he's a good puncher, but I think like Amir Khan beat him for the first five rounds and then just got caught.... he made an amateur mistake. I think Manny is better than that. With him, you just have to put a cap on.... on what he can weigh after the weigh-in. He does get very big, over twenty pounds and so forth, and you have to keep him at a certain range to be fair," Roach said.

Pacquiao is not on the same page as Roach. He thinks a move to 154 for Canelo might be too much for him in terms of the size difference.

"I do not know [if that could be possible]. The 154-pound division looks like something that is too big for me. I can not say for sure right now [if that fight is possible," Pacquiao told ESPN Deportes.

"The welterweight division is not actually my real division. I could even fight in the division of 135 pounds, which is where I come from. But after that fight against [David] Diaz, I climbed to 147 pounds to face Oscar De la Hoya. and since then I've kept between 140 and 147. In order to make this weight, 147 pounds, I still have to eat a lot. That's complicated, because it forces me to eat several times during the day to make that weight. If I eat regular, three times a day, I'm like 140 or 141 pounds."