Floyd Mayweather puts in more hard work ahead of September fight before posing with actress Ruby Rose

• Floyd Mayweather has stepped up his training ahead of September fight
• Andre Berto is a leading contender for Mayweather's next opponent
• Danny Garcia says he won't chase a huge payday with the Money Man
• Orange Is The New Black actress Ruby Rose visited Mayweather's gym

Floyd Mayweather is showing no signs of letting up ahead of what might be his last fight this September, sharing with his army of fans precisely what it takes to be the pound-for-pound boxing king.

As speculation intensifies over the identity of Mayweather's opponent on September 12, the 38-year-old only had eyes for another gruelling workout at his personal gym.

And he was visited by star of American comedy-drama series Orange Is The New Black Ruby Rose, who witnessed the session.

Mayweather was put through his paces ahead of his bout at the MGM Grand Arena in Las Vegas, but former WBC light welterweight champion Danny Garcia believes it is unlikely to be his last.

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Floyd Mayweather did some strength and conditioning work in the gym as he prepares for his ring return

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The undefeated heavyweight champion, who will be fighting on September 12, did work on a punch bag

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Orange Is The New Black actress Ruby Rose paid a visit to Mayweather's gym after suffering an ordeal

'I do not think he is going to retire,' Garcia told ESPN Deportes. 'There's too much money to be made. That could be [a fight for me]. Anything can happen in boxing.' 

Garcia has moved up to welterweight and faces his division debut against veteran Paulie Malignaggi on August 1. The undefeated American expects Mayweather to continue his career beyond his September fight - but he won't chase a huge payday with the Money Man.

'At the end of the day there are hundreds of fighters that challenge Mayweather,' Garcia added. 'He's Mayweather. He is the source of income. He can basically pick whoever he wants to fight.

'So I can call out his name or just remain silent and let it happen. If it is meant to happen, then it is bound to happen.'

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Former WBC light welterweight champion Danny Garcia thinks Mayweather will fight beyond this September

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Mayweather hos won 49 career fights to date and is leaving no stone unturned in his bid to remain undefeated

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Mayweather showcases his impressive fitness with a flurry of shots to a punch bag during his workout

Floyd Mayweather steps up training for September ring return

Andre Berto is a leading contender at this time for Mayweather's next opponent, with the 31-year-old talking up the possible fight on boxingscene.com earlier this week.

'I am happy to be in the running for this fight and am definitely up for the challenge. I know it will be a great fight if it happens,' said Berto.

Amir Khan, Canelo Alvarez, Timothy Bradley, Keith Thurman and Kell Brook are among the other names who would want to step in the ring.

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Mayweather will ultimately have the final say on who he fights next but Andre Berto is a leading contender

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The Money Man posted this picture on Instagram with the cryptic caption: 'September 12th. Whose next??'

But Mayweather will ultimately have the final say - as he did when he invited Orange Is The New Black actress Ruby Rose to his gym following his latest public workout.

The visit came after police arrested a man at Ruby's Los Angeles home on Thursday in response to the star reporting a gunman on the loose in her backyard.

Naturally, a trip to witness a man undefeated in his 49 career fights to date was more than welcome.