ANAHEIM -- The A's optioned left-hander Eric Surkamp to Triple-A Nashville and transferred right-hander Henderson Alvarez to the 60-day disabled list, retroactive to March 25, to clear roster space for Saturday starter Dillon Overton, who was promoted from Nashville to start against the Angels in his Major League debut.
The A's still need a starter for Wednesday's Interleague matchup with the Giants, and the club has penciled in rookie Sean Manaea, who made 64 pitches over 3 2/3 innings in a rehab start Friday with Class A Advanced Stockton.
Manaea (forearm) has been on the DL since June 14 and the lefty is eligible to be activated Wednesday.