Alvarez (shoulder) is expected to throw a bullpen session Saturday, the Miami Herald reports. The right-hander is working his way back from a second stint on the DL this season due to his balky throwing shoulder and finally appears to be making some progress. He's currently throwing on flat ground at a distance of 120 feet and will get back onto a mound this weekend. The Marlins have had a number of injured starters get back to the field recently and can afford to take things slowly with Alvarez given their new-found rotation depth.