The 60-year-old star has been called up as a witness and said she has information which will help the 'Thriller' singer's family's case against concert promoter AEG Live.
They have been accused of ignoring health concerns over Michael and hiring physician Dr. Conrad Murray - who was convicted of the involuntary manslaughter of the star following his passing in 2009 - and now Sharon has revealed she has evidence which could help.
Speaking on The Talk, she said: ''There were people at that company who knew he was not well but didn't care.
''Whether he performed or not, they'd still make money. I had conversations with people who said exactly that. I will tell people who said it.''
The former 'X Factor' judge could be joined by the star's ex-wife Lisa Marie Presley, Diana Ross, Quincy Jones and Price - although music blogger Dr. Funkenberry recently suggested the 'Purple Rain' hitmaker will probably not testify.
He said: ''Prince is so far down on the witness list, he will more than likely never get called.''
Michael's family are suing AEG for £26 billion, but the firm denies the charges.