North Queensland rugby league star Johnathan Thurston has been the victim of racial abuse at Parramatta Stadium, The Daily Telegraph reports.

In the wake of this week's investigation by Eels officials into Sunday's incident in which monkey chants were allegedly aimed at the Fijian-born Penrith captain Petero Civoniceva, it has emerged that Thurston received an apology from Parramatta after being racially abused at Parramatta Stadium two years ago.

The newspaper said an Eels fan abused Cowboys winger Matt Sing before turning on Thurston.

Thurston's uncle, Dean Saunders, then became irate at his nephew's treatment.

A letter written to Parramatta CEO Denis Fitzgerald at the time by a female spectator claimed the foul-mouthed fan said: "Go back to the jungle, you monkeys. Go climb a tree.'"

The fan also jumped up and made gorilla noises, the newspaper reported.

Parramatta then apologised to an angry Thurston and Sing before finding the culprit and banning him for life.

Thurston's agent Sam Ayoub told the newspaper that an incident did happen and Thurston was "riled".

"A few people got involved and there were some apologies. It was tidied up behind the scenes," Ayoub said.

Fitzgerald also confirmed to the newspaper that an incident occurred in 2006 and the fan was quickly identified and handed a life ban from the stadium.

"He was making outrageous racial slurs," Fitzgerald said.

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