St Kilda announced the signing over the weekend, with list manager James Gallagher stating Wilkie has shown sensational growth since arriving at the Saints.
“We’re rapt to have Cal put pen to paper,” Gallagher said.
“Since he’s come into the side, he’s become an integral part of our backline and that will no doubt continue moving forward.
“Last season we saw Cal really accelerate his leadership. Alongside fellow backman Dougal Howard, he has been enormous when it comes to setting the standards for the entire group.
“It’s testament to Cal’s work ethic and professionalism that he’s been able to achieve what he has from starting out as a mature-age rookie.
“We’re looking forward to seeing what he’ll produce in 2021 and are certain he’ll deliver well into the future.”
Wilkie made his debut for the Saints in the opening round of the 2019 season and has since played 41 games in the red, white and black.
This time last year, he was working as an accountant in Adelaide.
Callum Wilkie has been a revelation in 2019. pic.twitter.com/W8GFtjQCB0
— St Kilda FC (@stkildafc) July 15, 2019