Armstead is in the concussion protocol after leaving Sunday's 24-3 loss to the Seahawks with an eye injury, Marcel Louis-Jacques of ESPN.com reports.
The starting left tackle will have to clear the NFL's five-step protocol to play next week against Tennessee. Kendall Lamm is Armstead's backup.
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Dolphins' Terron Armstead: Good to go Sunday
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Dolphins' Terron Armstead: Moving through protocols
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Dolphins' Terron Armstead: Not playing Monday
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Dolphins' Terron Armstead: Still in concussion protocols
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Dolphins' Terron Armstead: Doesn't return Sunday
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