Olympic swimming legend Michael Phelps says he is ready to add to his record-breaking gold medal tally at the London Games this summer.

Phelps has 14 Olympic gold medals to his name, which is more than any other athlete in history.

On Monday, fellow American swimmer Tyler Clary, gave a newspaper interview in which he said he works harder than Phelps and is ready to beat him at London 2012.

Speaking at the University of Tennessee, Phelps responded to the criticism of his work ethic.

He said: "For me right now the only thing I'm worried about is myself and preparing myself to go out and represent my country and step up and wear the stars and stripes and try to swim as fast as I can."

He added: "There's nothing else that needs to be said about it."

The Olympic Games begin on July 27.