The 18-year-old has replaced his idol in the Scottish Premiership side's first-team this season.
Ahead of securing his first Scottish Premiership title win, Kieran Tierney has admitted that Celtic teammate Emilio Izaguirre was his hero growing up and recalled standing alongside the Honduran during the title celebration when the 18-year-old was a ball boy at Parkhead, The Scottish Sun reports.
The 29-year-old was coming to the end of his second season with the Hoops when he won his first Scottish Premiership medal - and seemingly met Tierney for the first time - and has subsequently been a part of the Bhoys squad that has remained at the summit for the following three seasons.
And with Ronny Deila's current crop virtually wrapping up a fifth successive crown with their weekend win over Hearts, Tierney explained how the celebrations evoked memories of when he met his idol four years ago.
"There are a few pictures of me on social media walking around on the lap of honour after Celtic won the league with Emilio Izaguirre," he told The Scottish Sun.
"I was only young and a ball boy.
"He was my hero when I was growing up, being a left back I modelled myself on him.
"I didn't say anything to him about it at Tynecastle. He probably wouldn't remember it even if I showed him the picture."
It is incredibly unlikely that upon meeting his hero for the first time, Tierney would have ever thought that he would have been replacing Izaguirre in the first-team years later.
But such is the rise that the academy graduate has enjoyed that he probably would not have imagined even at the beginning of this season that he would be ending it with a title medal and a place in the Hoops' first-choice starting line-up.
And the club will be hoping that when they do confirm their fifth league crown in a row, the next Kieran Tierney is among the youngsters walking around with the squad.