Of course, Paul's fighting fellow YouTube superstar AnEsonGib during a Super Bowl week extravaganza ... and JP's been training like an animal at Mosley's gym in Big Bear.
The footage -- part of DAZN's 40 Days doc -- is pretty impressive ... and despite Paul wanting to avenge his brother's loss and take on KSI, it's clear he's laser-focused for the January 30 fight.
KSI's played a huge role in making this fight happen ... continuously bating Jake until he accepted the match.
“I don’t like Jake and I think the whole world doesn’t like Jake,” KSI says.
“If he does manage to get past the Big Gibber then yes, I will fight Jake. 100%. But, that’s not going to happen, I don’t think he’s ready for Gib at all and that’s going to show on Jan. 30. I think Gib wins this hands down and that will be the end of the Paul brothers.”
But, not if Mosley -- a former 3-weight class world champ -- has anything to say about it ... the fight goes down next week!