hawthornfc.com.au reports that Gibson injured his left pectoral in a marking contest against the Swans in Round 8.
He was able to play out the game but further assessment revealed he’d ruptured the muscle and will miss around 10 weeks.
The Hawks have been hit hard by injuries, with Gibson joining Sam Mitchell (hamstring), Cyril Rioli (hamstring), Brian Lake (calf) and Brendan Whitecross (knee) on the sidelines.
Key forward Jarryd Roughead will also miss the Round 10 clash through suspension, after he accepted a one-week ban for a high hit on Ben McGlynn in Round 8.
Public tickets for the Round 10 blockbuster are currently exhausted. The best way to access the match is by purchasing a three-game membership for just $100.
To become a 3-game member, sign up online at weareportadelaide.com.au, over the phone by calling 1300 467 232, in person at The Port Club or by emailing membership@pafc.com.au
