Manny Pacquiao will reportedly donate half of his £80m windfall from fighting Floyd Mayweather Jr this weekend to charity.

The 36-year-old will meet unbeaten Mayweather at the MGM Grand in the early hours of Sunday morning, in what is expected to be the highest-grossing bout of all time.

It had been claimed that Pacquiao was intending to offer up a large slice of his fortune to good causes, despite ring legend Sugar Ray Leonard this week warning the Filipino star not to be too generous.

However, promoter Bob Arum told reporters: "I'm sure half of what Manny earns in this fight is going to go to charity. That is just Manny. We don't like to talk about money too much as more charities line up."

Pacquiao is expected to run for president of his native Philippines once his boxing career comes to an end.