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8/3/2013 4:56 P.M. ET

Without need for fifth starter, A's option Milone

OAKLAND -- With a pair of off-days looming and no need for a fifth starter until Aug. 13, the A's opted to exchange one of their starters for relief help from Triple-A Sacramento on Saturday.

Struggling lefty Tommy Milone was the odd man out a day after he gave up six runs on nine hits, including two two-run homers, in just 3 2/3 innings of a loss to the Rangers. Long reliever Evan Scribner took his roster spot.

"Tommy just needs to go down there and do his thing," manager Bob Melvin said. "He went through a little period here recently where he hasn't been pitching great, but he's still pretty good. And when you're sending a guy like Tommy Milone down, it means you have some good pitching, and we do.

"He's been giving up some hits, and maybe his command isn't like it was earlier. [Friday] night was his worst game. He's had a couple of these in his last four. We still have a lot of confidence in Tommy. He's a big part of this team, he's just not here right now."

Friday marked the second time in his last four starts Milone went four or fewer innings. He has a 4.81 ERA over his past 14 starts after posting a 3.71 ERA during his first eight.

He'll start for the River Cats on Thursday in Omaha, Neb.

"Obviously I feel like I haven't pitched like myself lately," Milone said. "I think it could be good to go down and work on myself and work on getting back to what I think I am and what I know I am as a pitcher, and hopefully I'll be back up here soon.

"I feel like that's the kind of pitcher I am, the guy who's always consistent and tries to keep their team in the game, and I haven't been that guy. Hopefully I can get that back."

Scribner joins the A's for the third time this year but first since May 10, when he was optioned to Sacramento, where he has a 2.48 ERA in 25 relief appearances. He has not pitched in two days, giving the A's a fresh arm following Dan Otero's 42-pitch relief performance Friday.

"Throwing as many pitches as he did yesterday," Melvin said, "you get into an extra-inning game today and you don't want to get caught short.

"Scrib's pitched in any number of roles for us. He's matched up, pitched an inning later in games, pitched length for us. He's a very versatile bullpen piece."

"It's always fun to pack your whole life up in an hour," joked Scribner, who got word of his promotion early Saturday. "Down there I felt great, throwing strikes, getting ahead. It's frustrating being away from the team, but we have fun down there too. It's something I think about on an everyday basis, but I try to stay focused on doing my own thing to try to get back as fast I could."

Rehabbing Anderson eyes another sim game

OAKLAND -- Rehabbing lefty Brett Anderson, fresh off two simulated innings of live batting practice Friday, will do the same on Tuesday. Except he'll pitch without a screen that day, and he'll do so in Stockton, Calif., home of Oakland's Class A affiliate.

There was thought that a rehab assignment was next for Anderson, but the A's are being extremely cautious with their Opening Day starter, who hasn't pitched since April because of a stress fracture in his right foot.

"We want to make sure each time his foot feels OK," manager Bob Melvin said.

It seems likely that a rehab start could come after Tuesday's simulated game, and if Anderson continues progressing without any setbacks, he should be able to return around the same time he did last year from Tommy John surgery (Aug. 21) or earlier. He's already up to 60 pitches.

Jaso still feels concussion symptoms 10 days later

OAKLAND -- Ten days after John Jaso landed on the seven-day disabled list with a concussion, Oakland's left-handed-hitting catcher is still experiencing the effects of being hit in the mask by foul tips three times in four games.

Jaso said he wakes up to ringing in his ears every morning "like I was at a rock concert the night before," and he won't fly with his teammates to Cincinnati, though joining the A's in Toronto is still a possibility.

A's manager Bob Melvin said Jaso will go through some "extensive testing" Saturday, and he can begin baseball activity in the next couple days if all goes well.

Jaso added that the A's have been in contact with a "concussion expert in Pittsburgh," which likely means Dr. Michael Collins, a University of Pittsburgh doctor who consulted with Brandon McCarthy after his head injury last year.

Jaso was required to spend at least seven days on the DL with his concussion, and he'll be transferred to the 15-day DL if he is not reinstated after 14 days, which may happen, considering he's yet to participate in any physical activity since the incident.

"I haven't started any activity to get my heart rate up," Jaso said. "I'm itching for that."

Worth noting

• Eric Sogard made his first start at shortstop since Aug. 6, 2012, on Saturday, allowing the A's to rest Jed Lowrie some and give him a start at designated hitter. Newcomer Alberto Callaspo subsequently made his first start with the A's at second base, and he was expected to play there again Sunday.

"Every now and then we're going to give Jed a day off," Melvin said. "Sogard's played quite a bit of shortstop before, just not this year. He does a nice job there."

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