The left-back has enjoyed an impressive and surprising year in the first-team instead.
The 18-year-old has enjoyed a meteoric rise this season as he has established himself as the Hoops’ first choice left-back.
That has culminated in a Scotland call up and recently being named the PFA Young Player of the Year following a series of impressive performances.
Indeed, it seems his displays have not gone unnoticed by other clubs either with reports already linking him to several Premier League sides.
It is all a surprise to Tierney though, who admits he expected to either be playing for the under-20s or out on loan at a lower league club at this stage.
“I never ever thought these things could have happened to me, especially at such a young age,” he told the Daily Record.
“People say coming through at Celtic is hard and there’s no doubt that it is because it is a club with such high standards.
“I was fortunate enough to be giving the chance when I’d probably have expected at this point to still be playing for the under-20s, or maybe been out on loan at a lower-league club.”
Tierney will now be hoping that he can impress the new Celtic manager and keep his place next season.
Ronny Deila is set to depart in the summer, and Tierney, alongside all of his Hoops teammates, will have to work to prove their worth once again.
His performances this season are not likely to have put the new man off though, with a bright future anticipated for both club and country if he continues as he has.