Mr Floyd died last Monday after a white police officer held him down by pressing a knee into his neck and sports stars have joined in the widespread condemnation.
Mayweather Promotions confirmed that the former five-division world champion had reached out to Mr Floyd's family with an offer to cover all costs relating to the funeral.
Tiger Woods added his voice on Tuesday morning. In a post on social media, the 15-time major winner wrote: "My heart goes out to George Floyd, his loved ones and all of us who are hurting right now. I have always had the utmost respect for our law enforcement.
"They train so diligently to understand how, when and where to use force. This shocking tragedy clearly crossed that line. I remember the LA riots and learned that education is the best path forward.
"We can make our points without burning the very neighborhoods that we live in. I hope that through constructive, honest conversations we can build a safer, unified society."