ADELAIDE, AUSTRALIA - JUNE 22: Tom Jonas of the Power looks on during the round 14 AFL match between the Port Adelaide Power and the Melbourne Demons at Adelaide Oval on June 22, 2018 in Adelaide, Australia. (Photo by Daniel Kalisz/Getty Images)

Port Adelaide defender Tom Jonas will miss at least four weeks of action due to a knee injury sustained against St. Kilda on Saturday.

The 27-year-old, arguably in career best form hurt his left knee in a tackle and limped off the ground.

Jonas will have arthroscopic surgery within a day to remove floating loose body from the joint within the knee and could miss as many as six weeks.

Jasper Pittard is a chance to return for the Power after sitting out the game against the Saints with a sore hamstring and will need to prove his fitness.