Duggan was due to challenge his one-match ban for a dangerous tackle at the AFL Tribunal on Tuesday night.
But the Eagles have since withdrawn that challenge due to the severity of the illness that Duggan is battling, with the 26-year-old now officially suspended for Saturday's clash with the Crows in Adelaide.
West Coast said Duggan fell ill on Monday night and was taken to hospital for observation.
Luke Edwards and Tom Barrass are among other Eagles players who have battled illness in recent weeks.
Duggan's illness and suspension means West Coast will be forced to make at least four changes this week.
Shannon Hurn (hamstring), Elijah Hewett (concussion) and Connor West (knee) have all been sidelined after suffering first-quarter injuries in last week's 63-point loss to Collingwood.
Barrass is a chance to return from his hip injury, while captain Luke Shuey is in line to return from his hamstring and ankle complaints.
Duggan has been one of West Coast's best players this season.
The premiership defender is averaging a career-high 23 disposals per game, and has shone when spending time in the midfield.
Duggan joins the likes of Hurn, Nic Naitanui, Jamie Cripps, Jack Darling, Jeremy McGovern, Liam Ryan and Tom Cole on a star-studded injury list.
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