Arizona manager Torey Lovullo said that Nelson (elbow) will begin a throwing program Saturday or Sunday, Alex D'Agostino of SI.com reports.
Lovullo said Saturday that Nelson has shown considerable improvement since landing on the injured list June 19 due to a strained right elbow. The skipper still believes that the right-hander will be able to pitch again for the big club this season, though it's unclear whether Nelson will return from the IL as a starter or reliever. A better idea of his return timeline and expected role should emerge as he clears hurdles in his throwing program.