Michael Jackson memorabilia, which includes handwritten lyrics and a fedora he once wore, is being auctioned off in Las Vegas next month.
Jackson memorabilia is set to go on sale in May
The collection, made up of about 2,000 items, spans the career of Jackson and his family from the mid-1960s through to the early 1990s.
However, a spokesman for the star, told Associated Press he was considering legal action to stop the auction.
Raymone K Bain claims her client is "extremely upset" about the sale.
The collection is currently on display at New York's Guernsey's auction house.
A price tag has not been put on any of the items, although Guernsey's president, Arlan Ettinger expects some of the pieces will generate a lot of interest.
The collection includes around 2000 items from the Jackson family
"Buyers will be of every description, from the most dedicated fans to the corporate buyer who sees this as interesting material to display," he said.
The collection made news in 2004 when some of the items, including Jackson's underwear, were turned over to investigators as evidence in a child molestation case.
Jackson was acquitted in California in 2005, after being accused of sexually abusing a 13-year-old.
The trial was sparked after British journalist Martin Bashir made a documentary in which Jackson admitted sharing his bed with children.
Fans can also bid for the items on eBay at the time of the live auction.
The sale will take place at in Las Vegas on 30-31 May.