That's less than two weeks since Anderson initially sustained a right oblique strain, an injury that typically calls for a lengthier rehab. Yet, the southpaw's encouraging progression could lead to an intriguing decision for a possible one-game American League Wild Card playoff on Friday.
Should the A's participate in the Wild Card game, it would be Tommy Milone's turn to go in the rotation. Yet, if Anderson gets through his bullpen session without any issues, he may very well be the preferred option for that game -- based on his experience -- if both he and the A's are comfortable with his returning to game action so quickly.
"I don't know," manager Bob Melvin said. "We have to see how we get there, and we do have to get there first. We're just trying to keep all of our options open, and see how he feels and see how everyone does leading up to that potential point."
If Anderson requires more than one bullpen session, he would likely not be ready to start a game until the AL Division Series.
Elsewhere in the rotation, lefty Travis Blackley appears to be in line for his Tuesday start, despite recent struggles, as Melvin noted he does not foresee any changes to the pitching schedule this week.