AnEsonGib will NOT be fighting Austin McBroom on July 30 ... and now the entire Social Gloves event is in serious trouble.
Sources tell TMZ Sports a head injury is forcing Gib to back out of the bout at Crypto.com Arena ... after doctors refused to clear the YouTuber to step into the ring.
We're told McBroom is scrambling to find a new opponent ... but it's not looking good.
If he's unable to get a fighter, McBroom says the event is at risk of being scrapped ... which would be bad news for people wanting to see two NFL running backs try to knock each other out.