MANILA, Philippines – A return to light-welterweight may be in the cards for Filipino boxing icon Manny Pacquiao, should he get past Jessie Vargas in their welterweight showdown on November 5 in Las Vegas.

Pacquiao will battle Vargas for the WBO welterweight championship in his comeback fight, after which he may be in line for a bout against the unbeaten Terence Crawford.

Crawford (29-0) holds multiple titles at light-welterweight (140 pounds), and will defend them against John Molina Jr. on December 10.

"The thing that I like about a Pacquiao-Crawford fight, is it would probably be held at 140-pounds, which is a more natural weight for Manny Pacquiao," Arum said on ESPN's First Take, as quoted by Boxing Scene.

Pacquiao himself has noted that he is not a natural welterweight, even saying he can drop to as low as 135-pounds. The "Pacman," who has won world titles in eight different weight divisions, has been competing in the 147-pound division since 2009.

Arum said that if Crawford can get past Molina in December, then he would "love to make Manny Pacquiao against Terence Crawford."

• WATCH: Pacquiao's hands looking as fast as ever

Another potential opponent for Pacquiao is Errol Spence, another unbeaten fighter at 21-0. Spence already holds a stoppage win over Chris Algieri, a former Pacquiao foe. Nevertheless, Arum said the American "hasn't really proven himself."

"He hasn't fought for a world title yet," Arum said of Spence. "He hasn't fought some of the best fighters in the welterweight division."

"Can he possibly rise to the top? Can he beat (Danny) Garcia? Can he beat (Keith) Thurman? We don't know," he added. "Probably, yes. The truth is, he's a terrific prospect, but he's still a prospect."

"Maybe, maybe, he has the goods to rise to the top."

For now, however, Pacquiao is focusing on his showdown with Vargas, which will be his first fight since his "retirement" in April.

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