Anderson threw 25 pitches and used his entire repertoire of off-speed offerings. Oakland manager Bob Melvin said that the lefty, who underwent his elbow operation last July, will throw another bullpen on Sunday.
After that, Anderson should head to the team's facility in Arizona to throw a two-inning simulated game, but Melvin isn't quite sure yet when that will be, nor when the pitcher could begin a rehab assignment.
"[That's] based on the fact that you always get yourself in trouble and there are always some hurdles," Melvin said. "Last time he was speeding through it so quickly and had to be shut down for a while. It's encouraging what we're seeing, but I think until he actually gets through these simulated games and so forth, it's tough to put a date on it."
Fellow injured pitcher Dallas Braden also threw a bullpen, his second in his rehab from a strain in his surgically-repaired left shoulder. Melvin didn't see it and could not comment on it, but Braden's first bullpen on Monday went well.
Neither pitcher was available for comment in the clubhouse, but Anderson did have this to say on Twitter:
"Threw a live bp today...felt good. [First baseman Chris Carter] hit a home run off me, but it's ok because I told him what I was throwing."
Both pitchers are expected to return to the A's at some point this season.