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7/24/2014 2:41 A.M. ET

A's targeting Sunday return for Callaspo

OAKLAND -- The A's could be welcoming back another of their rehabbing players as soon as this weekend.

Having already activated outfielder Josh Reddick, who made his first start since June 28 on Wednesday, the A's are nearing Alberto Callaspo's return.

"There's a chance he'll be ready by Sunday," said manager Bob Melvin.

That's the earliest date Callaspo is eligible to return, after hitting the disabled list July 12 with a right hamstring strain.

The A's infielder is already taking part in all baseball activity and could be sent out for a short rehab stint at week's end. When he does return, the A's could choose to option Eric Sogard to Triple-A Sacramento.

Sogard has been with the club since the start of 2013 but made just his fourth start of the month Wednesday. He's hitting .194 on the season, though he did collect a pair of hits in Sunday's win over the Orioles.

"That was a key game for him," said Melvin. "We'd like to see him back it up."

Cespedes day to day with sprained thumb

OAKLAND -- Yoenis Cespedes exited Wednesday night's game against the Astros with a right thumb sprain. X-rays were negative and he is considered day to day.

Cespedes went down as he hit a check-swing groundout in the fifth inning, and manager Bob Melvin said after the game that the left fielder hurt his thumb falling to the ground.

Cespedes played the field in the sixth before Craig Gentry replaced him defensively to open the seventh.

The injury put a damper on an outstanding offensive night for Cespedes, who homered twice to snap a 25-game homerless drought and matched a career high with five RBIs.

Foot pain keeps Vogt from catching, not hitting

OAKLAND -- Stephen Vogt has a bone bruise in his right foot that has kept him from catching lately, but the A's need his bat in the lineup, and Vogt plans to continue playing through it.

The issue certainly doesn't seem to be slowing Vogt down offensively. He entered Wednesday hitting .361 since his June 1 callup, which is tops in the Majors among players with at least 100 plate appearances.

"It's been going on for a while," Vogt said of the injury. "I wouldn't say there's any particularity, it's just my foot hurts. Just trying to get through it."

On Wednesday, Vogt started his first game of the year at designated hitter. A's manager Bob Melvin said Vogt has had the bone bruise before and aggravated it "a little while" ago.

"I think whenever I can DH him or something along those lines, hopefully it can get that much better," said Melvin. "Those things don't go away very quickly, and we certainly don't want to DL him, and he doesn't want to go on the disabled list."

Vogt has been trying various insoles and orthotics to ease the pain, and while Melvin hopes he can eventually return to catching, for now he would only end up behind the plate in an emergency situation.

The left-handed hitter has not caught since July 7.

A's dish out root beer floats for charity

OAKLAND -- The A's hosted their 15th annual Root Beer Float Day on Wednesday before their game against the Astros, and there were plenty of floats to go around -- that is, if you could wriggle your way through the massive crowds inside the Coliseum's Eastside Club.

Wednesday's event raised $29,189 for the Juvenile Diabetes Research Foundation, pushing the 15-year total to over $414,000.

Among the servers were manager Bob Melvin and 12 other A's players and coaches, including Sonny Gray, Scott Kazmir, Jeff Samardzija and Stephen Vogt. Former A's stars Jose Canseco and David Justice were also on hand, with Canseco drawing more attention than anyone.

The day is especially important to Melvin, whose daughter, Alexi, has Type 1 diabetes.

"It means a lot to me," Melvin said. "The support everybody's given for us is terrific, and then when you see guys like Jose Canseco and David Justice and guys like that, that means a lot. It really does."

Fans also flocked to meet an array of local media personalities, as well as hip-hop artist Biz Markie.

"We could hardly move," said Kat Dippert of Sacramento, who attended with her husband, Dustin. "[The A's] are always doing community service and other good events. It's neat. I don't know any other team that is so philanthropic."

"It's always good to know that, no matter how big they are, they're still willing to help out," said Mike Garza, an A's fan for almost 20 years. "That's nice to see."

Jane Lee is a reporter for MLB.com. Aaron Leibowitz is an associate reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.