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7/23/2014 6:47 P.M. ET

Belt having trouble shaking concussion

PHILADELPHIA -- First baseman Brandon Belt's slow recovery from a concussion is beginning to worry the Giants.

Manager Bruce Bochy initially expressed hopes that Belt, who was knocked woozy by a thrown ball during batting practice last Saturday, should have been able to participate in baseball-related activites by now. Instead, head athletic trainer Dave Groeschner often has sent Belt home after he reports to the ballpark.

Belt, 26, is on the seven-day disabled list reserved for concussed players. He's eligible to be reinstated Sunday, but that's unlikely to happen at the current rate.

"It's hanging on a little more than we thought," Bochy said Wednesday of Belt's discomfort. "We have some concern there."

Worth noting

• Second baseman Joe Panik, who rolled his right ankle by stepping on the side of first base in Tuesday night's first inning, remained on day-to-day playing status but believed that he'll be ready to play sooner than later.

"Right now, all signs are positive," Panik said.

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.