Rodriguez (shoulder) will throw a bullpen session Saturday, Nick Piecoro of The Arizona Republic reports.
Diamondbacks manager Torey Lovullo indicated the left-hander is likely to throw an additional bullpen session after that before progressing to live batting practice. Signed as a free agent in December, Rodriguez has been on the shelf all season due to a strained shoulder, and he'll likely require a multi-start rehab assignment before being cleared for his Arizona debut.