As far as the UFC Lightweight Champion is concerned, if Mayweather Jr. refuses to face him in the boxing ring, then the focus will shift to another legendary boxer in Manny Pacquiao.
McGregor made his feelings known via Instagram:
Here is a reply video I sent one of my protégés who was seeking advice on some boxing only pad work footage they sent me. I believe you will like it. The focus has been solely boxing lately but make no mistakes, the kicking and grappling aspects, and everything else got to do with unlimited free fighting, is still very much present in my thoughts. Floyd may crap his jocks after all and if so I will go back to true fighting or just pick another boxer like manny or something. But whatever that's another conversation. I like to build fighters and watch their progression. I have built many to this date, and all unintentionally. One is fighting in the UFC main event this weekend. When my son is born I will build him up into a multiple free fighting world champion also. Just like his old man. I look forward to it.
The video also shows McGregor displaying a little bit of his boxing skills, which he hopes will come in handy against either Mayweather Jr. or Pacquaio.
Whether the UFC Lightweight Champion competed in the boxing ring or the Octagon next, it will mark the first time he has competed since defeating Eddie Alvarez to win the lightweight title at UFC 205 this past November.