The Scot has struggled for fitness following his £25million switch from Celtic last summer, featuring in just 16 games in all competitions.
It wasn't until football's restart that Tierney made his first appearance under manager Mikel Arteta, but he has since been involved in all four games.
And the full-back put in a impressive display as Arsenal saw off the Blades 2-1 to reach the FA Cup semi-finals, where they will come up against Manchester City.
Tierney, who played in a back-three against Southampton, was utilised as an attacking full-back against Sheffield United.
It was a role that clearly suited the 23-year-old, who offered plenty of threat up top while remaining solid at the back.
It wasn't just on the pitch that Tierney made an impact, however.
Tierney snubbed the Gucci bag for the Tesco bag for life. Another reason to love the bloke. pic.twitter.com/LDFeMpHB2y— Simon Collings (@sr_collings)June 28, 2020
He was pictured stepping off the team bus and entering the stadium with just his phone and carrier bag in hand.
And Tierney poked fun at himself after the game, suggesting: "Every little helps."
— Kieran Tierney (@kierantierney1)June 28, 2020
Tierney was described by Jose Mourinho as having "a humble way of behaving" back in August of last year, while the defender also paid for his local pub team's kits shortly after joining Arsenal.
And it appears as if Tierney's temperament hasn't changed since.