Ibrahim Duarte, former tour manager of Justin Timberlake, is suing Timberlake and other members of 'N Sync for $US9.6 million for racial abuse.

"The popularity and money went to their heads and their true feelings about having a black front man became apparent. I endured their constant racial slurs, jokes and belittling comments to make it work," Duarte said.

Duarte stated: "In my 25 years in this industry, I've never been treated like this by any other artist." He claims he had to travel in a separate bus to the band and was told: "You black guys always f--- up."