The Scot made his competitive debut for the Hoops back in 2015, aged just 18, and has now been first choice left-back for both club and country over the last two seasons.
And according to the Mirror‘s John Cross, Man United are keeping a close eye on the youngster over the next few months.
Signing players from a side capable of going a whole season unbeaten under the tutelage of Brendan Rodgers, who ultimately became a meme south of the border, naturally precipitates some doubt.
Is the SPL, in its current state, really a place with enough quality to recruit players to feature in the Champions League next season? These are questions I feel we should ask straight off the bat.
But there is a reason Tierney attracted attention from the moment he became a regular at Parkhead: nimble, intelligent, devastatingly quick and surprisingly tenacious – he has seamlessly settled into the swing of life at Celtic, garnering a serial winning mentality in the process, and could perhaps feel as if another season strolling to the title wouldn’t help advance his career as much as challenging himself in a genuinely competitive league.