Yonder Alonso went 0-for-4 with two strikeouts on Monday, leaving him with a .115 average.
Yonder Alonso hit a game-tying two-run single in the eighth inning of Tuesday's loss to the White Sox.
Athletics and 1B Yonder Alonso avoided arbitration by agreeing to a one-year, $2.65 million contract.
Athletics acquired 1B Yonder Alonso and LHP Marc Rzepczynski from the Padres for LHPs Drew Pomeranz and Jose Torres and a player to be named later or cash considerations.
Susan Slusser of the San Francisco Chronicle reports that the Athletics have acquired first baseman Yonder Alonso from the Padres for left-hander Drew Pomeranz.
ESPN's Keith Law reports that the Padres and Athletics are close to a trade that would send Yonder Alonso and Mark Rzepczynski to Oakland for Drew Pomeranz and Jose Torres.
Padres activated 1B Yonder Alonso from the 60-day disabled list.
Padres placed 1B Yonder Alonso on the 60-day disabled list, retroactive to September 2, with a stress reaction in his back.
A bone scan of Yonder Alonso's ailing lower back revealed a stress reaction.
Yonder Alonso felt continued tightness in his lower back while swinging a bat recently.
Yonder Alonso (back) played catch and took dry swings prior to Saturday's game.
Padres assistant general manager Josh Stein said Thursday that Yonder Alonso (back) will be sidelined for a "couple more days."
Yonder Alonso left Tuesday's game versus the Rangers with lower back tightness.
Yonder Alonso doubled and homered in four at-bats as the Padres took care of the Braves on Monday.