By Chito Ebriega (staff@latinospost.com) | First Posted: Oct 08, 2013 02:34 PM EDT

Manny Pacquiao is eager to prove he can still mix it up with boxing's finest fighters, saying he's open for another showdown with archrival Juan Manuel Marquez and a slugfest with Floyd Mayweather Jr.

Pacquiao, who is preparing for his upcoming welterweight bout with Brandon Rios in November, believed as long as he's still fighting, the chances of facing either Marquez or Mayweather Jr. remains a possibility.

"As long as I haven't retired and they have not also retired, there is a possibility that we can all fight. There can be a part 5. I have not retired yet, and he is still fighting," Pacquiao said in a recent interview with Phil Boxing News on Friday.

Despite Marquez's strong stance against fighting Pacquiao again, the eight-time division world champion is still optimistic that both camps could come up with an agreement to forge a fifth showdown between them.

"Marquez vs. Pacquiao Part Five could still happen. I haven't retired and he's still fighting, so it remains a possibility," Pacquiao said.

When asked if a fight with Mayweather Jr. is still on his mind despite the failure of previous negotiations and the Grand Rapids native's insistence not to duke it out with a 'has been' fighter like him, Pacquiao remains a believer that such a high-profile showdown could happen down the line.

"In the sport of boxing, everything is possible, as long as the boxer is active, he can still fight anyone. Floyd remains active and I have no plans to call it a career, so just stay tune," quoted Pacquiao, who's looking to bounce back from a sixth-round TKO at the hands of Marquez last December.

Pacquiao has been working out at the gym for roughly a month now, but the intensity of his training will jump a notch higher with the arrival of head trainer Freddie Roach and conditioning coach Justin Fortune, who reunited with the fighting congressman as of late.

Pacman badly needs a victory in his next match, but a hard-hitting boxer like Rios could make the fight interesting.

"Pacquiao vs. Rios: Battle in Cotai" is scheduled for Nov. 24 at Venetian Macao in Macau, China.

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