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A BRUISED and battered Geelong will monitor the fitness of a host of key players ahead of its big clash against a resurgent Adelaide on Friday night.

The Cats suffered just their second loss of the season against Port Adelaide on Saturday night and the defeat came at a cost, with a quartet of players worse for wear following a physical encounter.

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The League leaders lost experienced forward Gary Rohan to concussion after a collision with Karl Amon and had Luke Dahlhaus (shin) and Jack Henry (hard knock) go down either side of that incident during a bruising third term at Adelaide Oval.

It was the second time that Rohan has been concussed during a match this season following a bump from North Melbourne's Sam Durdin in round eight and the former Swan will need to tick a few boxes during the week to be passed fit to take on the fifth-placed Crows at GMHBA Stadium.

Star midfielder Tim Kelly also picked up a knock late in the match, but Geelong coach Chris Scott is hopeful that all his injured players will be able to cope with the six-day turnaround and be fit to take on the Crows.

"(Gary) Rohan couldn't come back on with a bit of a head knock … Tim Kelly looked like he was really sore, but it turns out he's just winded I think, so not great in the moment but OK for next week," Scott said.

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The Cats also lost experienced key defender Lachie Henderson to a shoulder issue in the VFL at the weekend, although the seriousness of the injury is unknown.

Two of the best key forwards in the game also went down injured during a physical round of football, with Swans veteran Lance Franklin (hamstring) and Fremantle spearhead Jesse Hogan (foot) facing a few weeks on the sidelines after they were hurt over the weekend.

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Franklin injured his left hamstring for the second time this year during the third quarter of the Swans' impressive 19-point victory over the Hawks and early indications are the 32-year-old will be sidelined for up to a month.

"We will know more once he is assessed by the medical team early next week, but early indications are that he will miss three to four weeks," Sydney head of football Charlie Gardiner said.

Ruckman Callum Sinclair was concussed after diving for a mark against the Hawks, although he seemed to be in good spirits after his 100th AFL match and is expected to be fit to take on the Suns on Saturday evening.

The prognosis on Hogan isn't quite as clear, although scans on Sunday revealed the injury was not related to the stress fracture problem that ended his season when he was with the Demons last year.

The Dockers said Hogan would "return to playing football in the coming weeks".

Fremantle will also need to find a replacement for veteran midfielder Stephen Hill (hamstring) for its clash with Carlton on Sunday.

Unfortunately, the Dockers won't be able to call on former Gold Coast forward Harley Bennell, with the talented 26-year-old suffering a "significant right calf tear" when playing for Peel Thunder in the WAFL on Saturday.

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In other injury news:

- Essendon youngster Matt Guelfi was taken to hospital for scans on his ribs and upper abdomen following an incident with Eagles defender Jeremy McGovern on Thursday night and he will need to tick a few boxes ahead of the Bombers' clash against the well-rested Giants at Marvel Stadium on Thursday night. Influential forward Orazio Fantasia (soreness) will also be monitored after he had a quiet night against the reigning premiers.

- McGovern was offered a one-match ban by the MRO for the incident with Guelfi, but the Eagles have a ready-made replacement in the form of Nic Naitanui. The Eagles ruckman, who signed a new three-year deal on Sunday, got through his first game back from injury in the WAFL on Saturday and could come into contention to take on the Hawks next weekend.

- Experienced defender Jeremy Howe picked up a calf injury during the second quarter of Collingwood's narrow nine-point victory over the Western Bulldogs on Sunday and is considered unlikely to be fit for the clash against North Melbourne on Saturday. Fellow tall Ben Reid left the field during the opening term of the contest with a bloodied head, but returned later to boot three goals.