The defenseman went on to thank his family for all of their sacrifices throughout the years ... as well as the fans who have shown him love since day one.
"You picked me up when I was down, supported me through tough times, and had my back through it all!"
The free agent also praised the league for giving him a chance to compete ... and his fellow hockey players who "brought out the best in me" on the ice.
Subban started his pro hockey career in 2009 and played for the Montreal Canadiens, Nashville Predators, and New Jersey Devils. In 2013, he won the Norris Trophy, which is awarded to the season's top defensive player.
He reportedly earned over $73 million during his 13 seasons.
Subban is also a philanthropist who raised millions for Montreal Children's Hospital, donated $50k to George Floyd's daughter, and launched 'P.K.'s Blue Line Buddies" that's focused on building a bond between the police and the youth.