Geelong will be without ruckman Rhys Stanley for at least the coming week after the Cats tall suffered a "medium term" knee injury in Saturday's win over the Power.

The Cats confirmed on Monday evening that Stanley will miss Saturday's match against the Dogs after scans revealed minor cartilage damage, meaning the veteran ruckman has at least avoided serious injury.

“Rhys sustained a right knee injury during Saturday’s match against Port Adelaide and was subbed out of the game at half time,” Geelong medical and conditioning boss Harry Taylor said.

"In some positive news, scans showed only a minor cartilage injury and some bone bruising, with Rhys expected to be sidelined only in the medium term."

Geelong will have former Hawk Jonathon Ceglar, versatile tall Esava Ratugolea and uncapped ruckman Toby Conway available for selection for Round 20.

Veteran midfielder Sam Menegola is yet to exit concussion protocols, but will also be a chance to line up for the Cats at Kardinia Park this weekend.

“Sam is progressing through the AFL concussion protocol and will be a test later this week to determine his availability,” Taylor added.

Meanwhile, rookie midfielder Flynn Kroeger has been ruled out for the remainder of the season due to knee surgery, concluding a frustrating campaign for the Wandin product.

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“Flynn is having surgery on his knee this week in the hope of fixing a persistent injury that he has had for much of the season,” Taylor said.

“Flynn will undergo a specific reconditioning plan post his surgery that gives him a great chance of completing a strong off-season program.”

Geelong will host the Bulldogs at GMHBA Stadium at 7:25pm (AEST).