McGregor to Mayweather: 'Sign your end Floyd or you are just a mouth'

Conor McGregor is ready to go - he's just waiting on his opponent.

With the UFC Lightweight Champion taking care of his side of the potential blockbuster fight with Floyd Mayweather, the Irishman issued a challenge to his hopeful 40-year-old opponent after a workout Sunday.

Dana White confirmed earlier this week that he and McGregor have agreed to a deal for the megafight, and Mayweather believes the bout will come together.

So it appears things are all on Mayweather now to sign his end of the deal or be "just a mouth."