The 39-year-old Pacquiao, who's also a Philippine senator, confirmed the fight through his own account.
Instead Pacquiao will face a fearsome puncher in Matthysse, and while it's worth noting that the 35-year-old Argentine is, like Pacquiao, years past his prime, "La Maquina" has a freakish 36 knockouts in 39 wins - the most recent being his January destruction of previously unbeaten Thai Tewa Kiram for the WBA title.
Pacquiao is coming off a WBO welterweight world title loss to Jeff Horn in Australia back in July of 2017. He is ranked second in the division and has an overall record of 57-6-2.
ESPN boxing writer Dan Rafael provided more details in a story posted on the website of the popular American sports network, which will be one of the main broadcast providers of the event in the US. And while Bob Arum will still be involved with the fight, it seems that Freddie Roach will not be training Pacquiao for the July 14th showdown. Roach has been instrumental to Pacquiao's success and numerous world title wins.
When asked why Roach had been ditched - not necessarily permanently - after 34 fights, Pac-Man's adviser, Michael Koncz, told ESPN: "There was some concerns Manny had in the last fight and some statements Freddie made to the media that Manny wasn't very pleased about". So we're working with them on this fight.
Beyond a fight with Matthysse, Pacquiao is eyeing a showdown with two-time Olympic gold medial victor Vasyl Lomachenko (10-1, 8 KOs). We don't have any disputes with Top Rank.
Promoted by Arum, Lomachenko, a former World Boxing Organization super featherweight champ, is set to challenge WBA lightweight titleholder Jorge Linares on May 12 at New York's famed Madison Square Garden. Koncz said the fight with Matthysse, originally discussed for June, is taking place at a time when the senate in the Philippines is in recess, allowing Pacquiao time to train and fight.