Brisbane Lions great Jonathan Brown believes Etihad Stadium's surface near the boundary line is a workplace health and safety concern for the AFL.

Emerging Lions forward Michael Close will miss the rest of the season after rupturing the anterior cruciate ligament in his left knee during Sunday's clash with North Melbourne at Etihad.

Michael Close on the ground after rupturing his anterior cruciate ligament at Etihad Stadium. Credit:Getty Images

Close sustained the injury when he landed awkwardly in a marking contest close to the interchange bench, where artificial turf meets grass.