A new documentary on boxing phenomenon Manny Pacquiao will be released and expected to be on demand on November 17.

'Manny', out from Universal Pictures, is directed by Leon Gast and narrated by Liam Neeson.

It looks at Pacquiao's incredible career in the ring as well as his life outside it, including his unpromising start to life living in extreme poverty, and his later foray into politics and election to the Philippines Congress.

The documentary includes interviews with some of his fans, including actor Mark Wahlberg and comedian Jimmy Kimmel.

The trailer alludes to Pacquiao's devout Christian faith, with clips showing the boxer crossing himself and looking heavenward at his fights.

It ends with Pacquiao saying: 'Why do I box, why do I fight? Because it's God's will.'

Pacquiao, also known as Pacman, is the only boxer to win world titles in eight different weight classes.

His next big fight is against American Chris Algieri at the Venetian Macao on November 22, where he will be defending his WBO welterweight title.