PORT Adelaide ruckman Paddy Ryder could miss just one game after scans confirmed his hip flexor injury.

Ryder has been ruled out of Sunday's clash against Greater Western Sydney at Adelaide Oval.

However, the Power said he would be assessed next week heading into the round 19 encounter with the Western Bulldogs in Ballarat.

The scans showed Ryder had a hip flexor muscle strain, which forced him to sit out the second half of the Power's nine-point loss to Fremantle at Optus Stadium last Sunday.

Scans have also cleared forward Todd Marshall of major structural damage to his ankle after he was stretchered off in Port's SANFL loss to Adelaide last Sunday.

Marshall is out of a moon boot and no longer requires crutches, and will be assessed this week to see if he's a chance to play at any level this weekend.