Selected at pick 41 in the 2013 national draft, Kolodjashnij has become a regular in the Cats’ back six after making his debut for the club in 2015.
Geelong general manager of football Simon Lloyd told Cats Media that the new contract signalled Kolodjashnij’s long-term intentions at the Cats.
“Jake continues to learn and develop, as he has done since he first arrived at the club. He is an integral part of where we are going as a football club,” Lloyd said.
“He is a very consistent player and fits our team ethos.
“We are pleased that the club and Jake could reach this agreement so easily and quickly and look forward to him continuing with the club into the future.”
Kolodjashnij and the Cats will play their first game of the 2019 season on Friday when they take on Collingwood at the MCG.