Geelong defender Aaron Black suffered this horrific leg injury in the third quarter of his side's clash with North Melbourne at GMHBA Stadium on Saturday.

The 27-year old hyperextended his knee after landing awkwardly in a marking contest, and looks set for a stint on the sidelines.

Geelong coach Chris Scott was hopeful that Black had avoided serious injury.

"It (Black's incident) looked like a hyperextension, the more complicated part is what's damaged. It was sore enough not to come back on," Scott told reporters post-match.

"The indication we're getting that it's not a serious injury, but that's our best guess at the moment."

The unlucky Cat was helped from the ground by trainers and was immediately sent down to the rooms.

The former Roo has played 56 games since debuting in 2011, crossing over to Geelong in 2017, and has been plagued with injuries throughout his career.