Sydney have confirmed that both Tom McCartin and Tom Hickey will be unavailable for selection in Round 10 as the Swans take on North Melbourne, as both deal with respective head knocks.
Hickey will be sidelined after reporting delayed concussion symptoms following Sydney's loss to Fremantle in Round 9, the latest setback for the 32-year-old who has managed just one game so far this season.
"Tom reported delayed concussion symptoms following the game against Fremantle. He will not play against North Melbourne and will be managed as per AFL Concussion Guidelines," Sydney's head physio Damian Raper said.
McCartin meanwhile will miss his second consecutive game as he continues to experience headaches. The young Swan was sidelined earlier in the year after suffering a concussion against Port Adelaide in Round 4, but reported symptoms prior to the Swans' clash against Fremantle.
The club has committed to taking a conservative approach with the 23-year-old.
"Tom is still being managed after reporting mild headaches following the Round 8 game against Collingwood and will not be available for selection this weekend against North Melbourne," Raper said.
The Swans confirmed earlier in the week that both Callum Mills (calf) and Logan McDonald (ankle) would be joining the injury list for an extended period, with co-captain Mills to miss at least a month of footy.
"Callum has begun rehabilitation on his calf injury. We expect him to be out for 4-6 weeks," Raper said.
"Logan is expected to miss at least 8 weeks with a medial ankle sprain. He began rehabilitation this week."
Paddy McCartin meanwhile continues to be sidelined after suffering a concussion, the tenth of his career, in Round 4. The Swans confirmed on Thursday that the 27-year-old was doing "light aerobic exercise" as he continues his recovery, but maintained McCartin's wellbeing is the main priority of the club.
"Paddy is completing some light aerobic exercise as a part of his recovery. He continues to see external specialists as part of his recovery and his wellbeing remains the number one priority," Raper said.
The Swans will travel to Melbourne this week to take on North Melbourne at Marvel Stadium at 1:45pm AEST on Saturday.