Kluber (shoulder) threw 20 pitches off a mound Friday, Bryan Hoch of MLB.com reports.

EDGE Analysis

The veteran right-hander was limited to throwing fastballs and came out of the bullpen session with no issues. It's the first time Kluber's been on a mound since landing on the injured list in late May, so it's a significant step in his rehab work. The 35-year-old still has a ways to go before a potential return date is pinpointed, and he's unlikely to rejoin the Yankees before September.