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ISAAC Heeney is in doubt for Sydney's crunch clash against Geelong on Thursday night after the star midfielder suffered delayed concussion during its loss to Richmond.

Heeney returned before half-time after copping a knock midway through the second quarter, but was ruled out of the match during the third term.

The Cats could head into the contest without Mark Blicavs.

The key defender is battling a toe injury and has been wearing a moon boot following Geelong's loss on Friday night.

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Fremantle's shock loss to Brisbane was compounded by injuries to stars Nat Fyfe and Aaron Sandilands.

Fyfe hurt his right hamstring with 10 minutes to go in the first half and looks set to miss weeks, while Sandilands suffered a calf complaint during the warm-up and was a late withdrawal.

Richmond's Reece Conca will miss several weeks after he dislocated his left ankle in a sickening incident on Thursday night.

Conca will wear a moon boot for the next two weeks, before undertaking a conditioning program.

The Tigers face the Crows on Friday night, and Adelaide may be without David Mackay after he suffered a rib injury in Saturday's crucial win over West Coast.

North Melbourne will monitor the fitness of dangerous forward Mason Wood ahead of its round 16 meeting with Gold Coast.

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Wood spent the final moments of Sunday's game against the Bombers on the bench with ice applied to his hamstring.

The Roos will also keep an eye on midfielder Ben Jacobs, who was a late withdrawal because of ongoing concussion-related issues.

Luckless Bulldog Lin Jong – a late inclusion against the Cats on Friday night – can expect to be sidelined for some time, after he broke a collarbone during the first quarter.

Jong replaced Matthew Sucking, who again missed with Achilles soreness.

The Bulldogs will monitor Billy Gowers, who injured his right ankle in the first quarter.

Gowers battled on but looked sore at times.

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Lynden Dunn could be missing from the Collingwood side that will tackle Essendon in Sunday's MCG blockbuster.

The in-form key defender limped off with a knee injury in the third quarter of Saturday night's win over the Suns.

Jasper Pittard is in serious doubt to line up for the Power when they host the Saints on Saturday night.

Pittard missed most of the second half against the Blues with hamstring tightness.

St Kilda backman Nathan Brown left the field early in the third quarter of Sunday's surprise win over Melbourne and faces an uphill battle to be fit for Power clash.

Will Langford will be assessed ahead of Hawthorn's date with the Bulldogs, after he left Saturday night's loss to GWS early because of a finger injury.

The Hawks will be hoping to regain swingman Jack Gunston, who was a late withdrawal because of a corked calf.

In other injury news:

- Richmond captain Trent Cotchin spent some time off the ground after a knock to a knee but played out the game and should be fine to face the Crows.

- Sydney's Luke Parker suffered a knock to his right elbow when Richmond's Dylan Grimes collided with him early in the third term, but played the game out after having the joint strapped.

- Geelong superstar Patrick Dangerfield ran into the Etihad Stadium fence late in the third quarter and suffered a cut to his leg, but finished the match unhindered.

- Greater Western Sydney forward Jonathon Patton came from the field in the third term after hurting his right knee in a ruck contest, but returned to finish out the match.

- At Carlton, forward Matthew Wright split his head open late in Saturday's loss to Port Adelaide, while defender Jacob Weitering spent some time in the rooms at three-quarter time, but didn't appear hampered by injury when he returned. Both should be fine to board the plane to the Gabba to face the Lions on Saturday.