Kwon Hyeok-kyu issued an apology to Celtic supporters in an emotional farewell message.
The midfielder, 24, sealed a transfer exit to join Ligue 1 club Nantes during the summer window.
Kwon has penned a three-year deal with the French side, despite interest from Austria Vienna.
Kwon Hyeokkyu has left #CelticFC to join Nantes on a permanent transfer. Best of luck and thank you, Kwon! 💚🍀 https://t.co/GFVfrRw6dL pic.twitter.com/tNBnySSryt
— Celtic Football Club (@CelticFC) July 25, 2025
The South Korean midfielder - who spent time on loan at St Mirren and Hibernian - failed to make a competitive appearance for Celtic after joining from Busan IPark in 2023.
Celtic confirmed his departure, posting the message: "Kwon Hyeokkyu has left #CelticFC to join Nantes on a permanent transfer.
"Best of luck and thank you, Kwon!"
Signed on the same day as fellow South Korean Yang Hyun-jun in the summer of 2023, as well as Polish defender Maik Nawrocki, Kwon's only appearances for Celtic came in pre-season friendlies against Wolves and Athletic Club.
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After his exit was announced, Kwon shared a message with supporters through his personal Instagram account.
And in the message was an apology to supporters for his limited involvement in the first team in Glasgow.
Sharing a picture of himself in Celtic gear, he wrote: "Hi Celts, it's time to say goodbye.
"I didn't want to say goodbye like this, really sorry I didn't help team a lot.
"But I was proud to be a member of this team.
"I'll always support this team anywhere.
"Good luck with this season.
"Glasgow will be green forever."
