Kieran Tierney may have left Celtic, but the Parkhead club has not left Kieran Tierney.

That was evident during a live stream of Call of Duty with fellow pros when the ex-Hoops left-back was caught singing the song supporters had for former boss Ronny Deila.

Deila handed KT his debut six years ago as a youngster away to Dundee and the current Arsenal star has clearly never forgotten.

Playing COD with Scotland teammate Declan Gallagher, Tierney can be heard on the other end of the live stream singing the words: "We’ve got a boss called Ronny Deila, and if you’re feeling blue, I’ll song this song for you.

"Ronny Deila is Celtic through and through."

One fan shared a short clip on social media with the caption: "Kieran Tierney singing the Ronny Deila song is things you love to see". It has been viewed more than 29,000 times with over 2,000 combined likes and shares.