Parros left the Canadiens' 1-0 overtime win on the road against the New York Islanders on Saturday after a fight with Eric Boulton at 2:01 of the first period.
This is the second concussion of the season for Parros, who had not been diagnosed with a concussion over the first eight seasons of his career.
Parros missed 12 games with a concussion sustained on opening night against the Toronto Maple Leafs when his head hit the ice during a fight with Colton Orr.
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