Jake Paul might have a broken jaw -- but he's already looking for his next fight ... seemingly summoning Canelo Alvarez to the ring after being KO'd by Anthony Joshua Friday night.
Check it out -- the YouTuber turned pro boxer confirmed he's got a double fracture in his jaw from Joshua's punch .... even posting his X-ray to prove it. In the same breath, he stunningly hinted at a match against Alvarez, captioning the pic ... "Double broken jaw.