Police have found a man's body in water off a northern Sydney beach.

Water police were sent to Blue Fish Point in Manly on Wednesday morning following reports a man's body had been seen 400m offshore, a NSW police spokesman said.

Police said it was too early to say if the body is that of missing man Christopher Drake.

The 23-year-old was swept to sea from nearby North Curl Curl rock pool on Saturday as rough surf battered the coastline.