The Athletics outrighted Jackson to Triple-A Las Vegas on Tuesday after he cleared waivers.

The Athletics optioned Jackson to Triple-A Las Vegas on Wednesday.

Jackson (elbow/appendix) has made two appearances for the Athletics thus far during Cactus League play, covering two scoreless innings and striking out a batter while giving up one hit and one walk.

Jackson (elbow) underwent an appendectomy Monday and is without a timeline to resume his rehab program, Martin Gallegos of MLB.com reports.

Jackson (elbow) allowed two earned runs on two solo home runs while also recording two strikeouts over one inning in Single-A Stockton's win over Lake Elsinore on Saturday.

Jackson (elbow) began a rehab assignment with Low-A Stockton on Wednesday.

Jackson (elbow) threw another bullpen session Saturday, the Associated Press reports.

Jackson (elbow) did not feel any residual effects from Saturday's bullpen session, the team's official site reports.

Jackson (elbow) is slated to throw a bullpen session Saturday, the team's official site reports.

Oakland transferred Jackson (elbow) from the 15-day injured list to the 60-day IL on Wednesday.