Manny Pacquiao’s win against Jessie Vargas on Saturday for a welterweight title opened the door to a number of big-fight possibilities. Mayweather? Thurman? Garcia? But facing Canelo Alvarez, who currently holds a 154-pound title, seems to be a task too big, Pacquiao has acknowledged.

While the merger of Pacquiao and Canelo would be a potential PPV bonanza because of the popularity of the two fighters, Pacquiao expressed caution because of the size difference. “I do not know (if that could be possible),” Pacquiao told ESPN Deportes. “The 154-pound division looks like something that is too big for me. I cannot say for sure right now (if that is possible).”

Pacquiao, 37, has never fought above 147 pounds in his career. He turned pro at 106 pounds and admitted following his impressive performance against Vargas, in which he tipped the scales at 144 ¾ pounds, that he’s not even a real welterweight and has to eat more than he’s accustomed to make the weight. His trainer, Freddie Roach, is for the match-up, arguing that Pacquiao wouldn’t make the same mistakes Amir Khan did, but Pacquiao does not seem on board with the fight.

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