Meanwhile, Mayweather was believed to be in line to face Robert Guerrero, but he posted on Twitter: "The negotiations for my fight are almost done. The front runner is IBF Champion Devon Alexander. It'd be a unification bout at welterweight."
There is still uncertainty about whether the fight will be made, as Golden Boy CEO Richard Schaefer told ESPN.com: "[The comment] came from Mayweather and not me, so I cannot comment on it.
"Last I checked I was working on rescheduling the [Alexander-Brook] fight."
The fight will be Mayweather's first since serving a 90-day jail sentence.