On Thursday, he lost his battle with cancer.

The 23-year-old soccer fanatic died of the aggressive, rare bone cancer Ewing's sarcoma 11 months after being diagnosed.

His parents, Miro and Joanne, said Mark had been confident he would beat his illness, and his love of activity and the outdoors meant he struggled to stay in bed at his Horsley Park home in his final weeks.

"He was an incredible boy; he inspired us," Mr Tresoglavic said.

"If he saw his mum break down he would say: `Mum, don't be that way'.

"He wouldn't give in to the fact that he was dying.

"He would never discuss it."

The funeral service for the former Freeman Catholic College student was held on Wednesday at Our Lady of Victories Church, Horsley Park.

"Treso", as his mates called him, was honoured with a minute's silence before the kick-off between Sydney United and West Sydney on Sunday.

Former teammate Luka Glavas said he was deeply saddened to lose one of his closest friends.

"We've played together for seven years from the under-10s," he said.

"He was in my thoughts all through the game on the weekend."

Mark's death has been felt across the football world by those who have played with and against him over the years.

Football NSW media manager Mark Stavroulakis said: "We were very sad to hear the news.

"He fought to the end and he never gave up.

"It is a tragedy for someone who was only 23 years old."

Mark had a brief stint with Granville Rage in the Super League.

Club secretary Vic Zappia said: "He was a talented, sometimes cheeky footballer, who was respectful of and respected by his fellow teammates".

His family thanked the community, Mark's friends, and Fairfield Community Health Service for their ongoing support.