McArthur is still on the mend from offseason surgery on his right elbow, so this move isn't an indication of his progress after it was reported a few days earlier that he'd begin the year on the IL.
McArthur (elbow) is expected to begin the season on the injured list, Anne Rogers of MLB.com reports. McArthur underwent surgery in the offseason to address an olecranon fracture in his right elbow.