Colin follows Lukas Jutkiewicz, Connal Trueman and Harlee Dean in penning fresh contracts.BCFC
The French defender's previous agreement was due to expire in 2021.
Colin follows Lukas Jutkiewicz, Connal Trueman and Harlee Dean in penning fresh contracts.
Colin, 27, has performed to a consistently high standard for Blues since joining from Brentford in August, 2017.
He quickly established himself as an integral part of the Blues side, playing in an understated, unruffled manner.
The right-back made 43 Championship appearances last season.
Colin, who came to England from Anderlecht in 2015, has also played at left-back for Blues and on the odd occasion in midfield.