Programming note: Giants-Pirates coverage starts today at 3:30 p.m. with Giants Pregame Live on CSN Bay Area.
The Giants swapped outfielders on Thursday morning.
San Francisco activated Nori Aoki from the seven-day concussion disabled list and placed Hunter Pence on the 15-day disabled list with a left oblique strain.
Aoki will play left field and bat sixth Thursday against the Pirates.
The 33-year-old left the game Aug. 9 in Chicago after being struck in the helmet by a pitch from Jake Arrieta. He played again on Aug. 12 vs. Houston, but left the game and was placed on the DL after feeling light-headed.
Aoki also missed 28 games with a fractured right fibula -- an injury he sustained June 20 at LA -- when Dodgers starting pitcher Carlos Frias hit him with a pitch.
He is hitting .548 (17-for-31) with runners in scoring position and two outs -- the highest figure in the majors. With runners in scoring position, he's 16-for-his-last-30 (.533) and is hitting .375 (21-for-56) overall.
Aoki has just one strikeou in his last 110 plate appearances and has gone 163 games without an error in the outfield -- the longest active streak among NL players.
Pence lands on the DL for the third time this season after playing all 162 games in each of the past two seasons with the Giants.
[RELATED: Oblique strain puts Pence back on DL]
An MRI revealed that Pence has a "moderate oblique strain," and he's expected to miss at least two weeks.
"It's a tough time of year to lose one of your best players," manager Bruce Bochy said. "He's so inspiring and the energy he brings, it's obvious that's a tough one for us."
Pence said he has never had an oblique injury so he's not quite sure how it will respond. Giants doctors told him it could have been worse, and the hope is that he's ready the first week of September.
Pence has already missed 68 games this season with left wrist and forearm injuries, but he said he isn't frustrated by the run of bad luck.
San Francisco media services contribute to this report