The Scot has been a revelation for the Gunners following his £25million move to London in 2019.
Speaking to Arsenal's matchday programme ahead of the win over Leeds last season, Tierney was asked about life after football.
He said: "I have thought about it, but it's hard to say with it being so far away.
"It's not crossed my mind to do any coaching badges or anything like that yet.
"Some of the older players talk about it, and doing the qualifications, it's probably something you think more about when you get over 30, but before that it's all about your playing career.
"Well when I finish playing I'll be back in Scotland, no doubt going back to my old life of supporting Celtic home and away again!
"I'll be back there doing something anyway.
"I'll definitely live in Scotland when I finish playing, 100 per cent. I miss it every day."