The Ross County star was never played regularly in his best position.
It was a reward that probably had Cetic fans scratching their head – as the Bhoys let him go.
Irvine was snapped up by Celtic in 2010 as a teenager from Melbourne Victory and even went on to play one game for the club. He came on as a half-time substitute against Hibernian in September 2012, but has not featured for the first-team since.
In the summer he joined Ross County, turning a loan move from Celtic permanent, and it was a deal that has paid off for the player.
This week he has been speaking to SBS’ The World Game about his carer so far and his plans to add to his solitary Australia international cap.
He also spoke about why he never made it at Celtic:
“It’s been by far my best season.
“Obviously I didn’t get to break through at Celtic and I had difficult time when I went to Kilmarnock on loan.
"I was chopping and changing position every other week from right back to centre back, and the wide areas.
“I couldn’t claim that position in the midfield.”
It seems he was never truly given a chance to thrive in his best position – which is clearly in the defensive midfield role.
He also expressed his happiness at Ross County – where he has lifted the Scottish League Cup this season:
“So, to go from that, to sitting fourth in the league for the majority of the season and to win a trophy is just a massive contrast to the last couple of years. I couldn’t be happier with how things have gone.”
“I am still contacted for another year and I will be back in the summer fully prepared for that. If something was to develop we'd assess that when the time comes. I am open to all possibilities and opportunities.”
In the future this Celtic star may be up for a big move away from Ross County.
But he has certainly come of age with The Staggies and he will hope to continue proving Celtic wrong in the years to come.