Kieran Tierney may have joined Arsenal for £25m last summer, but he's not forgotten the Old Firm derby.
He played 170 times in all competitions for the Celtic before making the move to the Emirates Stadium and experienced plenty of success prior to his transfer.
Part of the squad to win the title five times, the Scottish Cup three times and the Scottish League cup three times, it's safe to say Tierney enjoyed playing for his boyhood clubs.
Perhaps as much as playing against Rangers.
And he took the chance to show his affinity with the Scottish giants by replying to their arch-rivals on Friday.
The official Twitter account of Rangers asked for the “best pics of you and your family and friends at Ibrox.”
In the reply, Tierney included a picture of him and his Celtic teammates celebrating in front of a packed away end after a win the Old Firm derby, along with the caption reading “Stay safe.”
Of course, this prompted a massive reaction from Celtic as well as Arsenal supporters on social media.
Take a look at what was said on Twitter...
Despite spending most of his time on the sidelines, Tierney can still pick out his favourite moment in an Arsenal shirt thus far.
"Probably the reception I got from you guys on my debut," he said during a Q&A session on Reddit
"Making an appearance after injury is always brilliant but the Arsenal fans took me so well with a round of applause at the start as well as when I was substituted so the night of making my debut against Forest was just a great night."
