“He can go all the way. We forget he’s 22, so he’s not even matured fully yet. He’s got so much ahead of him," he said.
“He’s been outstanding for Celtic and Scotland. This might be a big weight off his mind now, but it’ll be a new challenge for him.
“It might be difficult for him to adjust to because of his home life in Scotland and how much he loves Celtic.
“It’s a real wrench for him to go. But it’s progression, isn’t it?”
Tierney hasn’t made a competitive appearance since the middle of May having recently undergone a double hernia operation.
Celtic boss Neil Lennon reveals two reasons Kieran Tierney may struggle at Arsenal (Image: GETTY)
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Celtic boss Neil Lennon reveals two reasons Kieran Tierney may struggle at Arsenal (Image: GETTY)
He is expected to miss the first few weeks of the season as he returns to fitness.
And Tierney admits it wasn’t easy to leave Celtic but he’s looking forward to testing himself in the Premier League.
He said: “Yeah, it was the hardest decision in my whole life that I've had to make.
“I had to speak to my family and my close friends and my agent as well because it's a hard decision to leave a club that you love so much.
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