WESTERN Bulldogs captain Bob Murphy will on Monday learn the full extent of the left hamstring injury that will keep him sidelined for "some weeks".

In the dying minutes against St Kilda, the 34-year-old pulled up and immediately reached for his left leg as he attempted to stop Saints midfielder Jade Gresham, who was running in his direction in the centre square.

Murphy received an encouraging pat on the head from club doctor Gary Zimmerman and finished the match on the bench.

"I'd imagine he'd probably miss some weeks," Bulldogs coach Luke Beveridge said on Murphy.

"Even though we've got a bye (this week) I wouldn't think he'd be available for the Sydney game (in round 12)."

Murphy missed the Bulldogs' drought-breaking premiership last year after tearing the anterior cruciate ligament in his left knee against Hawthorn in round three.

West Coast key forward Josh Kennedy also faces a nervous wait to discover the severity of the right calf injury he suffered in the final quarter against Greater Western Sydney.

The 29-year-old felt a sharp pain while changing direction as he ran into a vacant forward 50, forcing him to collapse to the ground.

Kennedy was helped from the field and had ice strapped around his lower leg following a brief assessment on the bench.

Eagles coach Adam Simpson said the star goalkicker heard a "pop" in the off-the-ball incident.

"The diagnosis at the moment is it's a calf (injury), but it's early on so we'll see how he pulls up (and) get a scan," Simpson said.

Sydney midfielder Jake Lloyd's night ended in the opening minute of the match against Hawthorn, leaving the Swans one rotation short from the outset.

Lloyd's head accidentally collided into Hawk Liam Shiels' knee while being swung in a tackle by former Swan Tom Mitchell.

The 23-year-old was noticeably groggy as he left the ground with trainers nearby, taking no further part after failing a concussion test.

Sydney was down another man after the main break, with forward Sam Reid also going down with concussion.

The 25-year-old's head hit the turf in a tackle from Hawks veteran Shaun Burgoyne near the boundary line in the second quarter.

A clearly dazed Reid remained on the ground, at least initially, and then went off for assessment during a short stint on the bench.

He was cleared to return for the closing two minutes before half time, but was forced to sit out the second half after experiencing concussion symptoms.

"We were just about to run out at half time and (Reid) couldn't see the screen, I think, so he was ruled out," Swans coach John Longmire said post-match.

Reid emerged from the rooms well into the third quarter, walking to the bench to join Lloyd as a spectator.

In other injury concerns in round 10:

- Western Bulldogs forward Clay Smith was a late withdrawal against St Kilda due to a calf injury he sustained at the captain's run session. "He's tweaked that calf. (I'm) not sure how long he'll be out … he's missed today so hopefully it's not too bad," Bulldogs coach Luke Beveridge said post-match.

- Collingwood forward Darcy Moore went off the ground in the third quarter against the Brisbane Lions with a right shin complaint, but came back to see out the game.

- North Melbourne midfielder Trent Dumont was left a little dazed in the final quarter after colliding with Carlton midfielder David Cuningham in a tackle. "He was fine to come back on so … he's no worries," Kangaroos coach Brad Scott said post-match.

- North Melbourne defender Aaron Mullett needed medical attention midway through the second quarter after picking up an accidental knee to his right cheek from Carlton captain Marc Murphy. Mullett returned and finished the game.

- Western Bulldogs midfielder Lin Jong went down the race after the game against St Kilda holding an ice pack to his forehead. The 23-year-old received an inadvertent elbow while tackling Saints onballer Blake Acres in the closing seconds.

- Western Bulldogs midfielder Lachie Hunter rolled his left ankle after standing on Saint Jack Steven's foot in the final term. Hunter walked off gingerly but returned after a short rest on the bench.

- Geelong swingman Harry Taylor left the field briefly after being accidentally poked in the eye by Port Adelaide defender Tom Clurey during the final quarter.

- Geelong defender Jed Bews needed attention for a corked left quad he suffered in the third quarter against Port Adelaide. The 23-year-old had his leg strapped and hopped on an exercise bike at the interchange area before returning. "(It's) nothing significant enough to suggest he's in doubt for next week," Cats coach Chris Scott said post-match.