Controversial pop legend Michael Jackson has undergone a series of 50 health checks to prove his fitness in order perform a series of his upcoming London concerts.

A UK-based website has reported that there were doubts about the 50-year-old star's fitness which prompted promoters to seek undertakings on his well-being.

A source close to AEG, the American owner of the O2 arena that is paying Jackson £150 million for around 30 shows confirmed the development. They insisted that the pop star submitted himself to a series of rigorous medical check-ups before the deal was agreed. AEG has also obtained insurance against Jackson falling ill and becoming unfit to perform.

A source from AEG said: "The concerts will be absolutely amazing. Jackson will sing and also dance. He would have to be in good health or else nobody would insure the concerts and we obviously have got insurance." Sampurn Media