7:09 PM PT -- Conor just Tweeted following his operation, writing ... "Just out of the surgery room guys! Surgery went excellent! Feeling tremendous! 6 weeks on crutch and we build back! Let’s go! God bless 🙏"
Conor McGregorjust underwent a successful 3.5-hour surgery in Los Angeles ... where doctors inserted a rod in his tibia and his fibula was fixed with plates and screws, sources tell TMZ Sports.
McGregor -- who suffered the gruesome lower leg injury during his fight with Dustin Poirierat UFC 264 -- was transported to Cedars-Sinai hospital in L.A. where he underwent the procedure this afternoon.