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6/25/2013 3:05 A.M. ET

Giants send down reliever Machi, add Kontos

LOS ANGELES -- The Giants exchanged right-handed relievers with Triple-A Fresno on Monday, recalling George Kontos and optioning Jean Machi to the Minors.

Machi was 2-0 with a 3.86 ERA in 25 appearances with the Giants, but he allowed six runs in 3 1/3 innings spanning his last five outings. That stretch ended with a two-thirds-inning performance against Miami on Sunday in which he surrendered four runs and four hits, including two homers.

"He showed signs of fatigue," Giants manager Bruce Bochy said. "This will allow him to catch his breath and get back on track. I think he did a great job when he was fresh, helping set up."

Kontos, who also showed signs of being worn down when the Giants optioned him to Fresno on June 12, was 2-1 with a 3.52 ERA in four Triple-A games. He's appealing a three-game suspension that he received the day he was demoted for throwing a pitch at Pittsburgh's Andrew McCutchen the night before. Kontos remains eligible to perform while appealing his penalty.

In another bullpen-related development, Santiago Casilla (right knee) demonstrated that he's closer to being reinstated from the disabled list by throwing off a mound. Bochy said that Casilla could throw to hitters Wednesday, which would be one more significant test to pass.

Arias calls hamstring strain 'not too bad'

LOS ANGELES -- Giants shortstop Joaquin Arias left Monday night's game against the Los Angeles Dodgers in the second inning with a strained left hamstring.

Arias said that he injured himself while scoring the Giants' lone run in their 3-1 defeat. He hit into a fielder's choice, then scored from first base on Andres Torres' two-out double.

"Not too bad," Arias said, describing the extent of his injury. He estimated that he would need a couple of days to recover.

Giants manager Bruce Bochy described Arias' ailment as "mild" and noted that the utility man will be re-evaluated Tuesday.

Arias made his fifth start of the season at shortstop, temporarily giving the Giants another right-handed bat in the lineup against Dodgers left-hander Hyun-Jin Ryu. Brandon Crawford replaced Arias at shortstop.

Kickham to start as Gaudin goes on DL

LOS ANGELES -- Finally deciding that Chad Gaudin's bruised throwing elbow wouldn't calm down enough to allow him to start Tuesday, the Giants placed the right-hander on the 15-day disabled list Monday and recalled left-hander Mike Kickham from Triple-A Fresno.

Injured when he was struck by a line drive last Thursday off the bat of Miami's Derek Dietrich, Gaudin played catch Monday. But though his condition improved, according to manager Bruce Bochy, the Giants already had summoned Kickham to Dodger Stadium in anticipation of this very move.

Kickham, 24, made his Major League debut May 28 at Oakland to replace the injured Ryan Vogelsong -- a role that Gaudin soon inherited. Kickham absorbed the decision in the Giants' 6-3 loss, lasting 2 1/3 innings and yielding four runs and four hits. He struck out three of the first six hitters he faced before Oakland's Derek Norris hit a two-run homer, hastening his unraveling. The next day, Kickham returned to Fresno.

Having dipped his toe into big league competition, Kickham's ready to jump in.

"I kind of know what to expect," said Kickham, who was 3-5 with a 4.81 ERA in 14 starts at Fresno. He also had 69 strikeouts and 33 walks in 78 2/3 innings. "Having been there before will benefit me."

Chris Haft is a reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.