Jake Paul is already getting interest from the MMA community ... 'cause Wiz Khalifa -- who is part-owner of the Professional Fighters League -- tells TMZ Sports he'd love to sign the YouTuber-turned-fighter to the promotion!!
25-year-old Paul has flirted with making the switch from the ring to the cage recently ... in hopes of landing a fight with Jorge Masvidal -- or pretty much any other fighter in the MMA community at this point.
He seems to be serious about the switch .