Brett Anderson is back from Tommy John elbow ligament replacement surgery, and set to make his season debut Tuesday night against the Minnesota Twins.
The left-hander was activated from the 60-day disabled list Monday, ready to pitch in the major leagues again for the first time since undergoing surgery 13 months ago.
Oakland optioned right-hander Dan Straily to Triple-A Sacramento and cleared room on the 40-man roster for Anderson by designating catcher Anthony Recker for assignment.
The 24-year-old Anderson has lost more than 20 pounds from his previous playing weight of 248 - and noticed he felt stronger late in games during his minor league rehab appearances.
Anderson went 7-6 with a 2.80 ERA in 19 starts during 2010, then 3-6 with a 4.00 ERA in 13 starts last year.