OAKLAND -- A's outfielder Coco Crisp left Saturday's game against the Mariners after fouling a ball off his right foot for a second straight day and will sit Sunday as a precaution.

Crisp took the ball off his foot in the first inning but played through 4 1/2 innings before Ryan Sweeney was inserted as a pinch-hitter in the fifth and remained in the game for the next frame in center field.

Crisp, who has played through multiple injuries this season, was 0-for-2 before his departure but had entered the game batting .289 with two home runs and nine RBIs over his previous 10 contests after collecting just five hits in his previous 34 at-bats.

Melvin has plenty of options out of bullpen

OAKLAND -- Lefty Brian Fuentes' return from the bereavement list on Saturday gave A's manager Bob Melvin 11 bullpen arms, making for plenty -- perhaps too many -- relief options.

"We know what our group's going to be in the plus-games, from the late sixth, seventh inning on, and now the balance is going to be finding innings for everybody else," Melvin said.

With the regulars remaining in their usual roles, some of the recent additions will be battling for innings. Right-handed newcomers Neil Wagner, Jason Rice and Andrew Carignan will likely be used -- as Carignan was in Friday's game -- in contests already decided by the later frames.

Still, Melvin will be keeping a close eye on all of them.

"It seems like we're stockpiling some pretty good power arms in the bullpen in the organization, which is good to see," he said. "You see a guy like [Fautino] De Los Santos and Carignan, we've got some pretty good arms down there.

"For the most part, they'll be games we're behind or fifth-inning type of situations if a starter comes out early. But there's always the caveat, they can move up if they pitch well and take advantage of the opportunity like De Los Santos has done."

De Los Santos was expected to slowly be eased into a significant bullpen role, but he posted a 2.35 ERA over the first 12 contests since his July 1 promotion and did not allow any of his nine inherited runners to score, influencing Melvin to rely on him for key seventh-inning situations sooner than anticipated.

De Los Santos entered Saturday with 37 strikeouts in 27 innings this season, averaging 12.33 per nine innings.

Rookie Weeks works on sliding technique

OAKLAND -- Jemile Weeks' overzealous ways on the base paths influenced some extra work on his sliding technique Saturday morning.

The A's rookie has been tagged out sliding over the base three times on stolen-base attempts this season, so he teamed with manager Bob Melvin, first-base coach Tye Waller and special adviser Phil Garner to work to avoid such outs.

Two of the outs have come from head-first slides, while the most recent in Friday's game came about following a feet-first move.

"He's been late in his slides," Melvin said. "There's a double-edged sword with that, because it means he's getting more strides in, which means he's getting to the base quicker, but he's going to have to find a way to have the bag stop him or pop up. We have to find a way for him to not continue to slide over the bag."

Their morning work extended off the field, as well, with Weeks joining the coaches to watch video of other notable basestealers who are also known to slide a little late. Among those viewed was Red Sox outfielder Jacoby Ellsbury.

"He's kind of a late slider too, but he pops up, which doesn't allow himself to go over the base," Melvin said.

The A's skipper prefers the feet-first slide, since several injuries to the hands and fingers are suffered from head-first slides, and said Weeks -- owner of 21 stolen bases this year -- is likely to stick to the latter form.

"He's really aggressive, and that's what you don't want to take away from," he said.

Worth noting

• Manager Bob Melvin said he's currently considering using a spot starter after the next turn through the rotation in an effort to give pitchers like Brandon McCarthy and Rich Harden with injured pasts some rest.

"If we can get [Trevor] Cahill and [Gio] Gonzalez to increase their innings, we can take them to another level next year," Melvin said. "It's the guys that have been injured we want to take care of and get them to the finish line healthy."