The allegations, which have not been proven, state that no act has won the show who hasn't been an "invited or preferred" contestant. The allegation was included in a blog post by someone who claimed to be an anonymous Sony Music source.
It has since gone viral on social media sites including Twitter. The claims have been flatly denied by the entertainment giant, which has stated it will "not hesitate to take whatever legal action is appropriate" to prevent further "unfounded allegations".
Parke has been described by the press as the new Justin Bieber, the singing sensation who hit the headlines after his mother posted videos of him singing on video site YouTube. He is currently 11/10 odds on favourite to win 'Britain’s Got Talent,' according to bookmakers Ladbrokes.
Parke impressed the 'Britain’s Got Talent' judges, including the returning Cowell, with his performance of Adele's hit 'Make You Feel My Love' earning himself a place in thw final of the show.
Monday's show attracted a peak audience of 13.5 million viewers, more than a million more than last year's first live show.
According to unofficial overnight figures, 'Britain's Got Talent' peaked at 13.5 million, a 49% share, across ITV1, ITV1 HD and ITV1 +1. It had a peak audience of 13 million, without the contribution from ITV1's time-shifted channel.
The full official statement from Syco/Sony said: "There has been speculation on the internet that 'Britain's Got Talent' finalist Ronan Parke was known to and worked with Syco/Sony Music before entering the show.
"There is no truth in this story whatsoever. Ronan first came to Syco/Sony's attention when he entered this year's competition.
"Syco/Sony Music will not hesitate to take whatever legal action is appropriate to prevent further publication of these unfounded allegations."
This is not the first time Syco has been faced with problems from the blogosphere of social networking sites.
'The X Factor' publicity machine collapsed during last years auditions under an avalanche of social media activity when the names of four "wildcard" entries were unveiled online through Twitter.
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