Jake Paul is sending a warning to Myles Garrett ... saying the Cleveland Browns star better not get in the ring with his older bro, Logan -- 'cause he'll get KNOCKED OUT!!!
The 24-year-old YouTube superstar is responding to Garrett's recent comments to Complex ... in which he claimed he would "beat the brakes off of Logan Paul" if he were to ever take a celebrity fight.
Jake -- who is a Browns fan -- gave his two cents on the matchup .