Arsenal fullback Kieran Tierney admits leaving Celtic was the toughest decision of his career.

The Scot left the Hoops for Arsenal last summer.

He told arsenal.com: "I would say leaving Celtic was the hardest decision I'd ever had to make and I knew I would always miss Celtic no matter what happens in life.

"But the chance to play for Arsenal was a challenge that when I heard of it, I was just looking forward to it."

Asked about a role-model, he added: "I wouldn't say I have a top three but I think the best is Roberto Carlos. I'm training in the morning at the moment and doing the programme that the Arsenal sports science team give me and in afternoons and nights I am playing PlayStation!"