Former Celtic left-back Kieran Tierney finally made his debut for Arsenal yesterday since leaving Parkhead for the Emirates Stadium for £25 million during the summer transfer window.

The Scotland international featured for 77 minutes as the Gunners strolled to a comfortable 5-0 victory against Nottingham Forest to book their place in the fourth round of the League Cup, and he was very impressive.

Tierney had to battle a double hernia and an Osteitis pubis problem in his last days at Celtic, and the injuries delayed his Arsenal bow.

The 22-year-old put in a solid shift in front of the Gunners fans, and some Hoops fans couldn’t help but watch their former club star.

Here is how some of them reacted on Twitter afterwards:

We were robbed for 25 million

— connor