Senator Manny Pacquiao is not done with boxing yet.

He has announced a world title fight against Argentina's Lucas Matthysse in Malaysia.

Pacquiao, 39, called himself the "underdog" for the June 24 fight against Matthysse, the World Boxing Association welterweight champion from Argentina.

"This is going to be a tough fight. Matthysse is also a knockout artist. But I'm excited to fight and be a world champion again," Pacquiao said in a statement.

"I'm the underdog in this fight but I'm used to it. It serves as a big motivation for me to train and fight hard to win the crown," added the Filipino great.

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Pacquiao said that unusually, he will be co-promoting the fight along with Golden Boy Promotions, which represents the 35-year-old Matthysse.

It signals an apparent break with long-time US promoter Bob Arum, who reportedly warned that the Kuala Lumpur card was not a done deal.

"Matthysse is one of the guys that Manny is thinking about fighting. There are others," Arum told boxingscene.com.

"The Malaysia part is up in the air. I don't know these Malaysian people. If they put up the money, it'll happen, happily. But do I know whether the money will be put up? No, I don't," Arum added.

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