Arsenal left-back Kieran Tierney admits that it was a tough decision to leave Celtic this summer.
The defender had long been linked to a move away, especially to a Premier League club.
But it took winning three successive league titles and getting a mega offer from Arsenal to finally tempt Tierney to leave a club he loves.
Tierney told the Daily Record: "It has been hard, people probably think 'he just moved for this reason or that reason' but they don't realise it was a big thing for me.
"I don't have to explain my love for Celtic, everyone knows it's my club and the club I've supported all my life. But this was a chance to move to a massive club in England.
"Everyone told me it was a great move, it's a chance to come here and play against some of the best players in the world.
"And every day I am training with some of the best players in the world too. It was an opportunity to better myself.
"Sometimes you have to look at your career as well as what your heart is telling you to do and it was the toughest decision of my life.
"It kept me up at nights thinking about it. People who are around me know how hard it was."
