Clarke MacArthur will not return for the Ottawa Senators this season, general manager Pierre Dorion announced Friday.

MacArthur has been denied clearance to pursue a return from team doctors and multiple specialists, despite being symptom free, according to TSN 1200's Dean Brown.

Dorion said MacArthur is "devastated" by the news.

MacArthur suffered his fourth concussion in 18 months when he took a hit from Patrick Sieloff in a training camp scrimmage. He's been limited to four games over the last two seasons due to post-concussion syndrome.

He said in October that he's unwilling to give up on his NHL career.

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