#2. Leg injury sustained at UFC 264
Conor McGregor has a mental hurdle he needs to overcome when he returns to the UFC. He suffered a broken leg in his most recent bout with Dustin Poirier, so he'll need to feel comfortable kicking again. Anderson Silva was in a similar situation after breaking his leg during his bout with Chris Weidman in 2013.
After going through the recovery process, McGregor might be forced to alter his fighting stance and style. The Irishman utilizes a karate stance when he fights, which has helped him find openings and land his powerful left-hand. It will be interesting to see how he performs following the injury and whether he remains aggressive with his strikes.
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'The Notorious' might find that his opponents begin targeting his surgically repaired leg if they notice a difference in his movements. Depending on when he returns, the leg injury would have kept him out of action for well over a year of his prime.
#1. Caliber of opponents he will have to face on his UFC return
McGregor is in a unique situation as he won't have an unranked opponent for his UFC return. Since he is clearly the biggest star in the promotion, he'll be matched up with the most appealing opponent available. This might not work in his favor because it means he'll likely be fighting a top-10 ranked fighter at either lightweight or welterweight.
'The Notorious' has already been linked with bouts against Michael Chandler, Jorge Masvidal, and even former lightweight champion Charles Oliveira. Depending on if/when he fights either of them, it could be when they're on a winning streak. .
If McGregor's return is contested at welterweight, there are a lot of matchups that wouldn't be favorable or ideal. The promotion relying on the biggest name possible could result in the former two-division champion's losing skid extending to three straight fights.