The singer apparently believes he is hugely underpaid by Fuller, the music mogul and Idol creator who is worth around £220 million.
"Will had to sign a contract when he won Pop Idol which gave Fuller a large percentage of what he earned," a 'friend' told the newspaper. "He had no choice but to sign, it was a condition of taking part in the show. But no one could have dreamed he would do so well. Now Will feels he has been given a fraction of the cash he’s raked in for Fuller."
Young has scored four number one singles and two number one albums since winning the show in 2002, making him the UK's biggest male solo artist behind only Robbie Williams.
“Will has had unbelievable success and it looks like he'll be around for a long time," the friend added. "He knows he earns a decent amount of money and is grateful for everything Simon has done. He values his advice hugely.
"But Will has been told that he has the potential to be a George Michael or a male Dido. So he has been seeking advice on how to get more money. Only his close friends and family know how he feels."