Sydney midfielder Josh Kennedy is expected to endure a stint on the sidelines across the coming weeks following an incident with Blues defender Sam Docherty that left both players requiring medical attention during Friday's clash.

In the second term of Carlton's bullish 15-point win, Kennedy arrived late for a marking contest, collecting Docherty high and likely warranting scrutiny from the Match Review Offer.

While Docherty was eventually able to return to the field after gaining medical attention on the interchange, Kennedy's night was drawn to a close after suffering a hamstring injury in the same incident.

The 33-year-old was left holding his thigh and grimacing on the Marvel Stadium turf as club medicos for both teams rushed onto the field.

Kennedy required assistance to be taken to the bench, with the Swans immediately pulling the trigger on their medical substitution and bringing young flanker Braeden Campbell into the game.

Speaking after the loss, Swans coach John Longmire revealed the club is expecting their veteran onballer to miss multiple weeks due to the injury.

"They said it was a bad hamstring," Longmire said.

"I don't think there's ever such thing as a good hamstring but if they say it's a bad hamstring it's going to be quite a few weeks you'd imagine," Swans coach John Longmire said post-game."

After undergoing concussion tests following the collision, Docherty was cleared to play out the remainder of the match, with the Blues recording no injuries of their own.

The suspected injury layoff for Kennedy is assumed to outlast a likely suspension handed down by the MRO, with Kennedy to learn his fate on Saturday evening.

The contested ball-winner's was the only ailment the Swans suffered in their fourth loss of the year, with Longmire likey to name suspended youngster James Rowbottom in Kennedy's place for next week's tussle with the Tigers on Friday at the SCG.