LONDON — Tom Jones has apologized to fans after pulling out of an Olympic celebration concert in London after contracting bronchitis.

The 72-year-old Welsh crooner had been due to entertain tens of thousands of people at the outdoor concert in Hyde Park on Saturday. He was replaced by British singer Will Young.

Jones tweeted "sorry to all," adding that doctors had ordered him to cancel gigs scheduled for Saturday and Sunday.

He later added: "Thanks for all the lovely messages, I don't know if everyone's understanding and support is making me feel better or worse! You're the best!"

The concert was part of the BT London Live series that is offering fans without Olympic tickets an opportunity to listen to music and watch sports on big screens.

Earlier on HuffPost:

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  • Opening Ceremony

    The five Olympic rings rise above a scene depicting the era of the Industrial Revolution during the Opening Ceremony of the London 2012 Olympic Games at the Olympic Stadium on July 27, 2012 in London, England.

  • Opening Ceremony

    An artist performs during the opening ceremony of the London 2012 Olympic Games on July 27, 2012 at the Olympic Stadium in London.

  • Opening Ceremony

    An artist performs as huge chimneys emerge from the ground to symbolise the industrial revolution during the opening ceremony of the London 2012 Olympic Games on July 27, 2012 at the Olympic stadium in London.

  • Opening Ceremony

    Performers depict a view of the English countryside during the Opening Ceremony of the London 2012 Olympic Games at the Olympic Stadium on July 27, 2012 in London, England.

  • Opening Ceremony

    A general view of the Opening Ceremony of the London 2012 Olympic Games at the Olympic Stadium on July 27, 2012 in London, England.

  • Opening Ceremony

    Artists perform during the opening ceremony of the London 2012 Olympic Games on July 27, 2012 at the Olympic Stadium in London.

  • Opening Ceremony

    Artists perform during the opening ceremony of the London 2012 Olympic Games on July 27, 2012 at the Olympic Stadium in London.

  • Opening Ceremony

    A drummer performs during the opening ceremony of the London 2012 Olympic Games at the Olympic Stadium in London on July 27, 2012.

  • Opening Ceremony

    Artistic Director of the Opening Ceremony Danny Boyle speaks whilst standing next to the Olympic Bell during the Opening Ceremony of the London 2012 Olympic Games at the Olympic Stadium on July 27, 2012 in London, England.

  • Opening Ceremony

    Chimneys erupt from the centre of the field during The Age of Industry scene in the opening ceremony of the London 2012 Olympic Games at the Olympic Stadium in London on July 27, 2012.

  • Opening Ceremony

    An artist performs as a chimney emerges from the ground to symbolise the industrial revolution during the opening ceremony of the London 2012 Olympic Games on July 27, 2012 at the Olympic Stadium in London.

  • Opening Ceremony

    An actor climbs a giant chimney during The Age of Industry scene in the opening ceremony of the London 2012 Olympic Games at the Olympic Stadium in London on July 27, 2012.

  • Opening Ceremony

    A performer climbs along a chimney emerging from the ground to symbolise the industrial revolution during the opening ceremony of the London 2012 Olympic Games on July 27, 2012 at the Olympic stadium in London.

  • Opening Ceremony

    Artists perform during the opening ceremony of the London 2012 Olympic Games on July 27, 2012 at the Olympic Stadium in London.

  • Opening Ceremony

    Huge chimneys emerge from the ground to symbolise the industrial revolution during the opening ceremony of the London 2012 Olympic Games on July 27, 2012 at the Olympic stadium in London.

  • Opening Ceremony

    Drummers drum during the Opening Ceremony of the London 2012 Olympic Games at the Olympic Stadium on July 27, 2012 in London, England.

  • Opening Ceremony

    Performers depict a view from the change of the English countryside to the Industrial Revolution during the Opening Ceremony of the London 2012 Olympic Games at the Olympic Stadium on July 27, 2012 in London, England.

  • Opening Ceremony

    Artists perform around chimneys during The Age of Industry scene in the opening ceremony of the London 2012 Olympic Games on July 27, 2012 at the Olympic Stadium in London.

  • Opening Ceremony

    Freshly 'forged' Olympic Rings fly above the chimneys during The Age of Industry scene in the opening ceremony of the London 2012 Olympic Games at the Olympic Stadium in London on July 27, 2012.

  • Opening Ceremony

    The Olympic rings are assembled above the stadium in a scene depicting the Industrial Revolution during the Opening Ceremony of the London 2012 Olympic Games at the Olympic Stadium on July 27, 2012 in London, England.

  • Opening Ceremony

    Rings representing both the Olympics and the Industrial Revolution are lit during the Opening Ceremony of the London 2012 Olympic Games at the Olympic Stadium on July 27, 2012 in London, England.

  • Opening Ceremony

    A general view of the the set depicting the English countryside during the Opening Ceremony of the London 2012 Olympic Games at the Olympic Stadium on July 27, 2012 in London, England.

  • Opening Ceremony

    The Olympic rings are assembled above the stadium in a scene depicting the Industrial Revolution during the Opening Ceremony of the London 2012 Olympic Games at the Olympic Stadium on July 27, 2012 in London, England.

  • Opening Ceremony

    Actors perform in the scene The Age of Industry during the opening ceremony of the London 2012 Olympic Games at the Olympic Stadium in London on July 27, 2012.

  • Opening Ceremony

    Rings representing both the Olympics and the Industrial Revolution are lit during the Opening Ceremony of the London 2012 Olympic Games at the Olympic Stadium on July 27, 2012 in London, England.

  • Opening Ceremony

    Artists perform as the Olympic rings are pictured above the stadium during the opening ceremony of the London 2012 Olympic Games on July 27, 2012 at the Olympic Stadium in London.

  • Opening Ceremony

    Rings representing both the Olympics and the Industrial Revolution are lit during the Opening Ceremony of the London 2012 Olympic Games at the Olympic Stadium on July 27, 2012 in London, England.

  • Opening Ceremony

    An actor dressed to resemble Britain's Queen Elizabeth II parachutes into the stadium during the opening ceremony of the London 2012 Olympic Games at the Olympic Stadium in London on July 27, 2012.

  • Opening Ceremony

    Actors perform during the opening ceremony of the London 2012 Olympic Games at the Olympic Stadium in London on July 27, 2012.

  • Opening Ceremony

    Actors perform during the opening ceremony of the London 2012 Olympic Games at the Olympic Stadium in London on July 27, 2012.

  • Opening Ceremony

    The Olympic rings float above artists performing during the opening ceremony of the London 2012 Olympic Games on July 27, 2012 at the Olympic Stadium in London.

  • Opening Ceremony

    Aerial view shows the Olympic rings being raised in the Olympic Stadium during the opening ceremony of the London 2012 Olympic Games on July 27, 2012.

  • Opening Ceremony

    Performers depict the industrial revolution during the Opening Ceremony of the London 2012 Olympic Games at the Olympic Stadium on July 27, 2012 in London, England.

  • Opening Ceremony

    Performers depict the industrial revolution during the Opening Ceremony of the London 2012 Olympic Games at the Olympic Stadium on July 27, 2012 in London, England.

  • Opening Ceremony

    General view of the Olympic Stadium as the Olympic rings float above artists during the opening ceremony of the London 2012 Olympic Games on July 27, 2012 in London.

  • Opening Ceremony

    Inflatable yellow submarines float above artists performing during the opening ceremony of the London 2012 Olympic Games on July 27, 2012 at the Olympic stadium in London.

  • Opening Ceremony

    A young performer holds a balloon during the Opening Ceremony of the London 2012 Olympic Games at the Olympic Stadium on July 27, 2012 in London, England.

  • Opening Ceremony

    Performers depict a view of the English countryside during the Opening Ceremony of the London 2012 Olympic Games at the Olympic Stadium on July 27, 2012 in London, England.

  • Opening Ceremony

    Drummers perform during the Opening Ceremony of the London 2012 Olympic Games at the Olympic Stadium on July 27, 2012 in London, England.

  • Opening Ceremony

    Actors and dancers play Great Ormond Street Children's Hospital staff and patients during the opening ceremony of the London 2012 Olympic Games on July 27, 2012 at the Olympic stadium in London.

  • Opening Ceremony

    Dancers playing Great Ormond Street Children's Hospital staff perform during the opening ceremony of the London 2012 Olympic Games on July 27, 2012 at the Olympic Stadium in London.

  • Opening Ceremony

    Dancers perform in the Gosh and NHS scene during the opening ceremony of the London 2012 Olympic Games on July 27, 2012 at the Olympic Stadium in London.

  • Opening Ceremony

    Dancers perform in the Gosh and NHS scene during the opening ceremony of the London 2012 Olympic Games on July 27, 2012 at the Olympic Stadium in London.

  • Opening Ceremony

    A general view of the Opening Ceremony of the London 2012 Olympic Games at the Olympic Stadium on July 27, 2012 in London, England.

  • Opening Ceremony

    Performers depict a view of the Industrial Revolution during the Opening Ceremony of the London 2012 Olympic Games at the Olympic Stadium on July 27, 2012 in London, England.

  • Opening Ceremony

    A general view of the interior of the stadium during the Opening Ceremony of the London 2012 Olympic Games at the Olympic Stadium on July 27, 2012 in London, England.

  • Opening Ceremony

    Performers depict a view of the Industrial Revolution during the Opening Ceremony of the London 2012 Olympic Games at the Olympic Stadium on July 27, 2012 in London, England.

  • Opening Ceremony

    A performer in the role of Daniel Craig as James Bond parachutes out of a helicopter with a Union Jack parachute during the Opening Ceremony of the London 2012 Olympic Games at the Olympic Stadium on July 27, 2012 in London, England.

  • Opening Ceremony

    The Union Flag is presented during the Opening Ceremony of the London 2012 Olympic Games at the Olympic Stadium on July 27, 2012 in London, England.

  • Opening Ceremony

    A general view is seen while performers depict a view from the change of the English countryside to the Industrial Revolution during the Opening Ceremony of the London 2012 Olympic Games at the Olympic Stadium on July 27, 2012 in London, England.

  • Opening Ceremony

    A general view is seen during the Opening Ceremony of the London 2012 Olympic Games at the Olympic Stadium on July 27, 2012 in London, England.