Alzolay (hamstring) threw another successful bullpen session Friday, Jordan Bastian of MLB.com reports.
Alzolay has been out for a week while dealing with a strained left hamstring, but the issue appears to be a minor one. He played catch just two days after landing on the injured list and quickly advanced to agility work. He's now thrown multiple bullpen sessions. A return Monday against the Rockies after a minimum-length absence appears to be in play.