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7/28/2014 12:20 A.M. ET

With Callaspo off DL, Freiman sent to Triple-A

ARLINGTON -- The A's activated Alberto Callaspo from the disabled list in time for Sunday's series finale in Texas, a move that prompted them to option Nate Freiman to Triple-A Sacramento.

The switch-hitting Callaspo, who was out the minimum 15 days with a strained right hamstring, was not in Sunday's starting lineup but could potentially see time at first base during the upcoming series in Houston, where the Astros are starting a pair of lefties.

Callaspo's ability to handle the position was a big factor in the A's decision to send down Freiman and keep second baseman Eric Sogard, who is digging his way out of an offensive slump in which he has six hits in his last 16 at-bats.

Freiman hit .212 with one homer -- a walk-off shot in Miami -- and six RBIs in 14 games, including eight starts.

"Callaspo's able to play some first base, so unfortunately for Fry, he was the guy," said manager Bob Melvin. "But he always does a nice job for us, is always prepared, a very hard-working kid who was very impactful for us last year. I wouldn't be surprised to see him back here at some point."

Callaspo will continue to play some second base, too, with Melvin deeming his decisions at the position "a day-to-day thing."

"We always try to run our best lineup out there on a particular day, whether it's matchups, someone that's hot," he said. "We try to do the best we can."

Crisp returning to Bay Area to have neck examined

ARLINGTON -- The A's sent outfielder Coco Crisp back to the Bay Area on Sunday evening for further evaluation of his sore neck, MLB.com has learned.

Crisp has been dealing with the issue for much of the season and was out of the lineup on Sunday for the second time in three days.

The A's will wait for the results of Crisp's examination before determining whether a stint on the disabled list is necessary, but he's not expected to be available for any of the three games in Houston this week, though manager Bob Melvin wouldn't rule it out.

Crisp, signed this offseason to a two-year, $22.75 million deal that includes a vesting option for 2017, has already been held out of 35 of the club's 104 games this season. That number includes a handful of routine days off but is more the product of the veteran's injury-prone ways, even though he's managed to stay away from the DL.

In this case, as Melvin noted before Sunday's game, there's a balance of giving Crisp the needed rest a trip to the DL would afford and keeping the team's leadoff man available on days he feels fine.

Crisp's impact on the club is significant, but he also hasn't appeared completely comfortable as of late, going just 8-for-45 over his last 13 games. He was hitting .308 over his previous 40 contests.

"Rest is the best thing for his neck," Melvin said, "yet there are times when he feels really good and it's not an issue, and times when it's pretty significant where he has trouble turning his head."

On those days the A's are able to offset Crisp's absence with an equally speedy outfielder in Craig Gentry, who started in center field on Sunday.

Jane Lee is a reporter for MLB.com. Read her blog, Major Lee-ague, and follow her on Twitter @JaneMLB. This story was not subject to the approval of Major League Baseball or its clubs.