TMZ Sports has confirmed the Bare Knuckle FC star is stepping up to face off against El Gallo next month ... which was initially supposed to be the blockbuster fight with the boxing legend before it was postponed due to the recent ulcer flareup Tyson suffered on a flight.

We're told the bout will now take place at Amalie Arena in Tampa, Florida ... and will air on DAZN Pay-Per-View.

As we previously reported, the Paul vs. Tyson fight is still happening in November.

It's a huge risk for Paul -- Perry is one tough dude ... and had a solid career in the UFC before transitioning to the bare-knuckle promotion.

Jake is coming off two lesser-known opponents -- Andre August and Ryan Bourland -- and he won in the very first round of both fights.

Perry is the current BKFC champ ... and is by far the biggest star in the org. with wins over Luke Rockhold and Eddie Alvarez.

Perry has been pretty open about wanting to get a piece of Paul ... he previously told TMZ Sports Jake would be his "dream" BKFC opponent.

Paul released a statement on his new matchup ... saying, "When Paul vs. Tyson was rescheduled, I knew immediately that I wanted to still fight on Saturday, July 20."

"Now, as I prepare for my fight against Iron Mike, there’s no better opponent for me than Mike Perry. He's a proven knockout artist who has shown to be a maniac in and out of the ring. This is the perfect experience for me to gain in advance of facing Mike Tyson."

He added ... "But getting that experience comes with risk. Those who know me know I’m a risk taker and while 'Platinum' Perry might try to end me, I’m Titanium Jake Paul and I fear no man."

Perry also addressed his new fight ... saying Paul is making "the worst mistake of his life."