Conor McGregor Standing On Broken Leg 3 Weeks After Gruesome Injury

It's only been 24 days since Conor McGregor shattered his left leg during the Dustin Poirier trilogy fight ... but The Notorious is already standing on the busted limb.

TMZ Sports has obtained a photo of McGregor outside of a Beverly Hills hotel ... rocking a walking boot, standing while chatting with a friend.

We're told shortly after the photo was taken, McGregor sat on his scooter and rode into the hotel gym -- where he put himself through a workout.

It's pretty damn impressive ... considering the injury only happened at UFC 264 on July 10.

Of course, Conor broke his left tibia and fibula ... and required a titanium rod, plate and screws to hold his shattered leg together.

Since the surgery the day after the fight, we've seen Conor do everything from working out to jamming out at a Justin Bieber concert (the 2 men also chilled together poolside).

To compare, Tiger Woods -- who also broke his tibia and fibula (amongst other injuries to the leg) in a February 23 car crash -- was still using crutches 155 days after his accident.