David Ross is expected to return from the bereavement list and rejoin the Cubs on Sunday.
Cubs designated RHP Brian Schlitter for assignment.
Cubs optioned LHP Zac Rosscup to Triple-A Iowa.
Cubs acquired RHP Fernando Rodney from the Mariners for a player to be named later.
Starlin Castro went 1-for-4 with a double and drove home the Cubs only run in Thursday's loss to the Giants.
Dan Haren was knocked around in a losing effort against the Giants on Thursday, surrendering five runs on six hits over his 6 1/3 innings of work.
Dexter Fowler is out of the Cubs' lineup again on Thursday due to discomfort in his right shin.
Kyle Schwarber is starting behind the plate in the Cubs' series finale Thursday versus the Giants.
Addison Russell (groin) went 0-for-3 with a strikeout in his return to the Cubs' lineup Wednesday.
Kris Bryant went 2-for-4 with a two-run single and a double in Wednesday's loss to the Giants.
Kyle Hendricks couldn't quite manage a quality start in Wednesday's loss to the Giants, surrendering four runs on five hits over six innings.
Cubs recalled OF Matt Szczur from Triple-A Iowa.
Cubs placed C David Ross on the family medical emergency list.
Rafael Soriano (shoulder) has begun a rehab assignment with Triple-A Iowa.
Dexter Fowler is not in the Cubs' lineup against the Giants on Wednesday.