Melbourne has confirmed ruckman Jake Spencer will miss six to seven weeks.
Spencer injured his AC joint in the Anzac Day eve clash against Richmond, and will see a surgeon on Wednesday.
Forward Tim Smith also has a fractured rib and a punctured lung, and will spend a few days in hospital.
Melbourne's general manager of football operations Josh Mahoney confirmed the news.
“Jake received a knock to his AC joint early in the game last night and was ruled out prior to half-time. He had scans today (Tuesday), which showed damage to the AC joint. He will consult a surgeon tomorrow, with the most likely option being surgery later in the week,” he told melbournefc.com.au.
Mahoney said Smith will be monitored more closely.
There is currently no time frame on his return.
“Tim was taken to hospital at half-time during last night’s match after a knee to his ribs," he said.
"Investigations have shown a fractured rib and punctured lung. He will stay in hospital over the next few days.”
There is more hope for Christian Petracca though, after the Demon hurt his knee.
The club is monitoring him, with the hope he will play next week.
"Christian received a knock to the knee early in the match last night," Mahoney said.
"He played out the rest of the match and has today been cleared of any major structural damage of the knee. He will be monitored during the week."