As previously reported, Amir Khan insists he would be ready to fight Floyd Mayweather in September if a showdown can be agreed with the undisputed welterweight champion.

Mayweather confirmed after outpointing Manny Pacquiao on Sunday that he will retire once he completes his six-bout deal with Showtime, with his final outing set to be in four months' time in Las Vegas.

The 28-year-old has revealed for the first time that with this year's Ramadan finishing on July 17, he would be able to complete his training camp in time to face the pound-for-pound king.

Khan faces Chris Algieri in New York on May 29 and is keen to focus on his light-punching American opponent, who was knocked down six times by Pacquiao during a massive points defeat in November.

Khan was at ringside at the MGM Grand to watch defensive genius Mayweather frustrate Pacquiao over 12 rounds to confirm his status as the greatest boxer of his generation.

The Olympic silver medallist spotted some flaws in Mayweather's masterclass.

"Mayweather looked great, he did what he had to do to win the fight, his accuracy was nothing but the best," Khan said.

"Mayweather is very skilful and patient and tries to make his opponents make mistakes. His workrate dropped tremendously because of his age.

"There were a few things there that I'd not seen before. When he takes a good shot he does panic.

"The only way to catch Floyd is with speed and explosiveness, which Manny had, but Manny didn't use that enough in the fight."

A potential roadblock to Khan's chances of meeting an opponent he has long pursued is the possibility of a rematch between Mayweather and Pacquiao, after it emerged that the Filipino was carrying a shoulder injury that requires major surgery at the end of this week.

It will be April 2016 at the earliest that Pacquiao can fight again and Mayweather has little sympathy for a foe he defeated with such conviction.

Mayweather said on Instagram: "19 years in the fight game and I've had one excuse: 'Don't have an excuse'. Winners win and losers have excuses'."