Port Adelaide forward Matt White has been ruled out for at least three months due to a tear in his right pectoral muscle.
The 28-year-old suffered the injury during the first quarter of Port's win over St Kilda on Sunday.
"It's a complete rupture to the pectoral muscle, which for Whitey will mean he misses at least 12 weeks,” Port high performance manager Darren Burgess said.
"It's really disappointing for him; unfortunately the symptoms present similar irrespective of the severity of the injury, so we couldn't confirm the detail until the scans.
"He'll spend six weeks in a sling and then we'll progress as required after that."