De Boer was involved in a contest with opponent Ben Cunnington in the third quarter, and was taken off with the injury and failed to play in the remainder of the game.
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Following assessment, de Boer was diagnosed with a fractured shoulder but will not need surgery.
“This is obviously disappointing for both Matt and the club, particularly after his stellar first half of the year,” GWS General Manager of Football Wayne Campbell told gwsgiants.com.au.
“Matt will no doubt attack his rehab with the same dedication and diligence he shows towards all aspects of his football and we look forward to welcoming him back in the second half of the season.”