Mercedes had an injury-hit second pre-season test in Barcelona on Thursday with Lewis Hamilton abandoning his running through illness and Nico Rosberg unable to replace him because of a neck issue.
As reported by BBC Sport's Andrew Benson, Mercedes have confirmed that the German Rosberg is out of action until an inflamed nerve in his neck heals:
Mercedes confirm that @nico_rosberg has an inflamed nerve in his neck, which he must rest to ensure it heals
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