Andre Ethier battling sore ankle

LOS ANGELES -- Andre Ethier woke up Saturday morning with increased soreness in his left ankle, prompting the Los Angeles Dodgers to recall a pair of outfielders for depth in the coming days.

Ethier has a condition similar to shin splints on the outside of his left ankle, manager Don Mattingly said Saturday before the Dodgers hosted the San Francisco Giants in the third game of their four-game series. Tests have ruled out any structural damage in the joint, leaving rest as the primary remedy.

"We're going to rest him and get him right," Mattingly said.

Ethier left Friday's game in the eighth inning after doubling down the right-field line. He originally injured the ankle while taking a swing against the Colorado Rockies earlier this month. Mattingly said the injury is most prevalent when Ethier rounds a base.

"That cut is what's making him sore," he said. "Straight on [running] is not bothering him."

With the Dodgers down to three natural outfielders -- Yasiel Puig, Carl Crawford and Scott Van Slyke -- and two utility players with outfield experience -- Skip Schumaker and Jerry Hairston Jr. -- the club brought up Nick Buss and Alex Castellanos, who have been working out at the team's spring training complex in Glendale, Ariz., following the end of their season at Triple-A Albuquerque earlier this month.

Castellanos, who came to the Dodgers from the St. Louis Cardinals at the 2011 trade deadline in exchange for shortstop Rafael Furcal, played 16 games with Los Angeles last season and four games in June, collecting two hits in nine at-bats. Both the Cardinals and Dodgers tried turning Castellanos into a middle infielder but abandoned those projects.

Buss was drafted out of San Diego Mesa College by the Dodgers in 2006 and again out of USC in 2008. He was named to the Pacific Coast League All-Star team this summer and went on to lead the PCL with 100 RBIs.

Meanwhile, Dodgers center fielder Matt Kemp, who led the National League in home runs and RBIs two years ago, is inching closer to a return, Mattingly said. Kemp has been limited to 62 games this season because of shoulder, hamstring and ankle injuries, but has more than 100 plate appearances between Class-A Rancho Cucamonga and the Arizona instructional league during his rehabilitation and is running the bases at full speed.

Kemp is not expected to be available when the Dodgers open a four-game series Monday at the Arizona Diamondbacks, but Mattingly expects him to be in the clubhouse.

"I don't want to send him out there and say, 'Hey, you've got to be careful when you play,' " Mattingly said. "As soon as Matt's ready to play, and medical says, 'This guy can go full bore, we're not worried about him' ... That's when we go."