Adelaide ruckman Sam Jacobs is considered a "50/50" chance to play against North Melbourne on Saturday night.

The Crows' big man sustained a knee injury in round two, and missed the clash against Geelong, but will be pushing his case for a call-up.

"Sam’s progressing nicely. He will still need to do a healthy amount of training tomorrow [Wednesday] to make himself available,” Adelaide's General Manager of High Performance Matt Hass told the club's website. 

"The decision will be made in conjunction with the doctor and the surgeon. He’s probably 50/50 for this week."

Running defender Paul Seedsman has already been ruled out due to a knee injury.