Conor McGregor feared it was curtains for his UFC career after breaking his leg against Dustin Poirier nearly two years ago ... admitting he thought the injury would force into an early retirement.
McGregor made the revelation in the trailer for his new Netflix documentary, "McGregor Forever," which dropped this week ... where he spoke about the severity of his injury from the hospital bed shortly after the July 2021 bout.
When the interviewer points out many experts thought the break would be impossible to return from, McGregor agreed .