It’s safe to say Unai Emery’s got Arsenal playing the beautiful football they became accustomed to under Arsene Wenger.

The flair’s back in their game, with goals pouring in from everywhere. However, one department he needs to work on is their defensive unit.

Not only do Arsenal need to be stronger down the middle, the Gunners also need more quality in the sides. Saed Kolasinac might possess a drive like none other, but is still quite lacklustre defensively, despite some relatively impressive showings during his time at the club.

The Gunners need a more reliable left back and according to reports (via The Scottish Sun), they’ve turned their attention towards Celtic’s Kieran Tierney.

The young left back’s been making headlines for all the right reasons in the Scottish Premiership, with his impressive performances for the Bhoys helping him gain attention. Arsenal are apparently ready to pay £25 million for the 21-year-old, who’s provided five assists in 15 appearances and also helped them Celtic keep nine clean-sheets (stats via Transfermarkt).

Despite being injured for a large chunk of the season, Tierney’s excellent work in recent years means he’s ready for the big leagues. Not only stable defensively with his assertive style and intelligence while defending, he also has pace and creativity to help boost any attack.

The young left-back can easily blend into Emery’s exciting system and elevate the Gunners' style all around.

Indeed, he can form a healthy competitive partnership with Kolasinac, slowly growing into a complete left-back, who can slowly help fix the Gunners' defensive frailties and add more thunder to their attack. With Nacho Monreal surely coming to the end of his FA Cup-laden time soon, Tierney would potentially be the heir Arsenal fans have been waiting for.