Celtic v Heart of Midlothian
Celtic's Kieran Tierney celebrates winning the premiership with the trophy (Photo: Reuters/Lee Smith)

Arsenal have announced the signing of Celtic fullback Kieran Tierney for a fee believed to be around £25m following a drawn-out transfer saga.

Arsenal have been linked with the Scottish player for the last month but had been previously turned by Celtic as their £25m bid was deemed unsatisfactory at first. However, all technicalities have been apparently brushed aside as Tierney has been confirmed to have signed for the Gunners. He's signed a long-term deal at the Premier League side and will wear the number 3 shirt.

In a statement posted at Arsenal's website, Unai Emery expressed his warm welcome for Tierney, saying "We're delighted Kieran is joining us. He's a very talented player who will continue to improve. He increases our options defensively, and I look forward to him joining our group."

With Celtic, Tierney won four Scottish Premierships and other domestic cup trophies. He was also considered as one of the Bhoy's best players in their current lineup.

Tierney is still recovering from the double hernia operation he had during the summer, and it will take another few weeks before he's considered fit to play. After recovery, the 22-year-old is expected to compete with Sead Kolasinac and Nacho Monreal for a starting spot at the Emirates.

Previous reports implied that the Gunners only had £45m to back Emery, but the club had seen some remarkable signings before the transfer window ended. William Saliba was signed before returning to Saint-Etienne on loan, Dani Ceballos is now on the Premier League from La Liga, and Nicolas Pepe was also signed for a club-record £72m.

Speaking after the announcement of the successful deal, Celtic manager Neil Lennon sent his warm wishes for Tierney: "This is an opportunity Kieran wanted to take, and while we will be sad to see him leave the club, we wish Kieran all the very best for the future.

Lennon applauded the leftback for his contribution to the club. The manager noted that he has enjoyed working with Tierney and that he will leave a big impact in the Premier League.

Tierney, who has captained both the Hoops and Scotland, leaves behind his boyhood club to join the Gunners. He first signed for Celtic at the age of just seven and made 170 appearances for the club.

As Tierney moves on to a new challenge, much is expected from him in playing for Arsenal.