Geary will enter his 14th season as a Saint in 2021 and will lead his side out this weekend for their first final in nine years.
Saints coach Brett Ratten lauded the 202-game veteran, stating his importance to the team as both a leader and a player.
“Gears is one of the best leaders in the game and his influence on our group and our entire club is enormous,” Ratten said.
“He is an incredibly resilient person, and we have seen that first-hand over the past few years with the way he has dealt with his own injury setbacks, but also the challenges we’ve been through as a club.
“The way he supported his teammates through the shutdown period earlier this year and then his leadership within the hub has just been first-class.
“Whether it’s playing in defence, up forward or on a wing, we know every job we give him is going to be performed to a really high level and that’s such a luxury for a coach.
The Saints will face the Bulldogs in an elimination final this Saturday at 4:40pm (AEST) at The Gabba.