San Francisco Giants designate Aaron Altherr for assignment, activate Drew Pomeranz

The San Francisco Giants designated outfielder Aaron Altherr for assignment on Sunday after just one at-bat with the team.

The move was made to open a roster spot for left-hander Drew Pomeranz, who was activated from the 10-day injured list to start Sunday's game against the Arizona Diamondbacks.

Altherr was claimed off waivers from the Philadelphia Phillies on May 11. He struck out Friday as a pinch hitter against the Diamondbacks in his lone opportunity for the Giants.

"We'll see what happens," San Francisco manager Bruce Bochy told reporters prior to Sunday's game. "A little bit of a tough deal, I couldn't get him some at-bats."

The Giants have seven days to either trade, release or place Altherr on outright waivers.

Before joining San Francisco, Altherr was just 1-for-29 with one RBI in 22 games for the Phillies. The 28-year-old has a lifetime .221 average with 36 homers and 148 RBIs in 333 big league games.

Pomeranz (lat strain) made his first start since May 6. The 30-year-old entered the day 1-4 with a 5.93 ERA this season.