Celtic sold defender Kieran Tierney to Arsenal on deadline day.

Celtic captain Scott Brown has told The Scottish Sun that he can’t rule out the possibility of left back Kieran Tierney returning to the club one day.

The Bhoys saw Tierney become a star at Parkhead during four years in their first team, but his time with the club has come to an end.

After a lengthy, summer-long pursuit, Arsenal finally got their man, completing a deal to sign Tierney on deadline day in England on Thursday.

Some Celtic fans haven’t been too impressed with Tierney’s decision, slamming him in the same way they blasted Brendan Rodgers for leaving to join Leicester City in February.

Tierney, 22, has though grown up supporting the Bhoys, and having won three trebles in a row with the club, seemingly just feels it’s time for something new.

The Scotland international is injured right now, but with Nacho Monreal in his 30’s and issues with Sead Kolasinac, both on and off the pitch, Tierney has a chance to immediately thrive for Unai Emery.

Given his love for Celtic, some have wondered whether Tierney could end up returning to the club one day, which would be a long way in the future as the youngster embarks on his Premier League career.

Now, Celtic captain Brown has admitted that ‘you never know’ whether Tierney could return, acknowledging that he loves the club, and most Bhoys fans would surely welcome him back despite his exit.

“You never know,” said Brown. “He loves the club that much that you can never say never, but you don’t know what could happen,” he added.

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