WESTERN Bulldogs captain Marcus Bontempelli is in doubt for next week's clash against Carlton after suffering an ankle injury in the loss to Melbourne on Wednesday night. 

Bontempelli sprained his ankle during the third quarter against the Demons and while he was able to play out the game, the superstar was clearly hampered by the injury. 

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"Like any ankle sprain, he has some pain and swelling that we are managing in the early part of this week," Dogs' head of sport medicine Chris Bell said.

"We will work through a process with Marcus into next week to determine his availability to play against the Blues on Thursday night."

Meanwhile, Jason Johannisen will miss at least the next two weeks after suffering a calf injury during the warm-up of the Demons' clash.

"Scans have confirmed our clinical suspicion that 'JJ' has suffered a calf muscle strain," Bell said.

"We will confirm our return to play plan over the coming days, but expect him to miss the next 2-3 weeks."

In better news, recruit Tim O'Brien will make his club debut against the Blues next Thursday night if he gets through training.