Arsenal fullback Kieran Tierney won't rule out a return to Celtic.

The 25-year-old left the Hoops three years ago at the end of the summer transfer window and has gone on to be a hit in the Premier League.

He told The Currie Club Podcast: "I think when a player who loves the club leaves there's always that, 'what if he comes back' and you can't rule anything out.

"I'm always going to love Celtic, I'm always going to support Celtic so you never know in football, you genuinely don't.

"There was a stage I thought I would never leave Celtic, you never know what can happen like anything, you need to take it game by game.

"It was heartbreaking, it was tough.

"There were nights where you struggle to sleep and you're thinking about it, not that you regret the decision but the reaction and just how it's panned out.

"You think you just wish it was in a nicer way or you could say goodbye in a different way. But that's the way it panned out."