Cahill enjoyed a stunning eight-year spell at Everton and the Australian international is considered as one of the finest goalscoring midfielders to have graced the Premier League.
Despite his exploits in England, the 36-year-old has now gone on to claim that guiding current club Melbourne City to triumph in the Australian version of the FA Cup by scoring the winner in the 1-0 victory over Sydney FC on Wednesday is up there with the best moments of his career.
The veteran said: "My feelings are pretty amazing.
"Everything we spoke about for the past nine months, leading into this campaign and the FFA Cup... the culture of the club, to bring a winning mentality and a group of guys together.
"When it hit my head - it's the story of my life… people will say he's done it again but that's why I play. I play for moments like that. Maybe for the other 50 minutes it was difficult to get on the ball and do whatever but that's not my job. My job is to be in the box.
"It's up there with the proudest moments of my career.
"You can have your wildest dreams... this is nice, it's in Australia, it's where I am from. I said I would give it everything, regardless of what people were saying about my age and my body."