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8/7/2014 1:50 P.M. ET

Belt sits finale due to headaches

MILWAUKEE -- Giants first baseman Brandon Belt was bothered by headaches that aren't believed to be related to his recent concussion, but manager Bruce Bochy still took a cautious approach and kept him out of Thursday's lineup.

Belt struck out four times Wednesday night as the headaches began bothering him. The discomfort forced him to leave the game in the ninth inning.

Bochy said that Belt was examined after Wednesday's game by a Brewers team physician, who found nothing wrong with him. Bochy nevertheless kept Belt on the bench "to make sure he doesn't have any issues." Buster Posey replaced Belt at first base while Andrew Susac took Posey's usual spot behind the plate.

Belt returned from the disabled list Saturday after recovering from his concussion, which forced him to miss 12 games. He entered Thursday hitting .237 with 11 home runs and 24 RBIs.

Duffy optioned to clear roster spot for Pagan

MILWAUKEE -- Joe Panik's surge of competence left no viable role for Giants infielder Matt Duffy, who was optioned back to Double-A Richmond before Thursday's 3-1 loss to the Brewers.

Duffy's departure cleared roster room for center fielder Angel Pagan, who was reinstated from the disabled list and immediately reclaimed his customary spot atop the Giants' batting order. Pagan went 2-for-5 and made a sliding catch to rob Milwaukee's Mark Reynolds.

Shortly after the Giants purchased Duffy's contract from Double-A Richmond last Friday, Bochy said that the 23-year-old would play at least semi-regularly for the Giants, mostly at second base. Then Panik went 8-for-14 in a three-game stretch, contrasting with Duffy's 1-for-10.

"Joe's been playing so well, it's hard to find time for [Duffy]," manager Bruce Bochy said.

Meanwhile, Panik has impressed the Giants with his poise as well as his production.

"He's a solid player," Bochy said. "He does a good job defensively; he doesn't miss signs; he's not a speedster, but he's a good baserunner. He knows how to play the game."

Chris Haft is a reporter for MLB.com. Read his blog, Haft-Baked Ideas, and follow him on Twitter at @sfgiantsbeat. This story was not subject to the approval of Major League Baseball or its clubs.