Hmm... "somewhere in the internet", right?

I don't know why anyone should take such unsubstantiated rumors seriously. Match fixing don't happen at this level, and we have to remember that Manny Pacquiao is also a politician. If he do something like this (which is impossible), then his political career will be ruined. These rumors were circulated by someone who wanted to tarnish his reputation. And I would say that most probably, his political rivals are behind this.

All that said, odds are heavily in favor of Pacquiao. Pacquiao at -450, and McGregor at +325.