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7/5/2013 9:56 P.M. ET

Casilla to pitch twice more for Triple-A Fresno

SAN FRANCISCO -- Reliever Santiago Casilla expects to be activated during the current Giants homestand, but first he has one more obstacle to clear: pitching in back-to-back outings.

The San Francisco setup man, who has been shelved since May 21 when a cyst was removed from his right knee, struggled in his third rehab appearance Thursday night for Triple-A Fresno, allowing one run, four hits and one walk in two-thirds of an inning.

Despite the struggles, Casilla said he feels good and expects to pitch Sunday and Monday for Fresno, with a possible return early next week when the Mets play at AT&T Park.

"When I started pitching [at the beginning of the rehab stint], it felt like Spring Training," said Casilla, who added that his command has steadily improved with each outing.

"You want to pitch, you want to play. Right now I want to pitch."

Casilla was a reliable component of manager Bruce Bochy's bullpen during the first two months of the season, posting a 1.89 ERA in 19 appearances. The bullpen has suffered from not having a consistent right-hander to set up closer Sergio Romo in Casilla's absence.

"He's doing great," Bochy said. "I don't know what day we'll activate him, but there's a good chance it's this homestand. It should be real soon."

Giants bring up outfielder Gillespie from Triple-A

SAN FRANCISCO -- The newest addition to the San Francisco roster, Cole Gillespie, admits he did not see a callup in his near future.

The outfielder said he was called into the manager's office after Thursday night's game at Triple-A Fresno where skipper Bob Mariano told him the Giants wanted him in the Majors.

"I actually tried to get [some information] out of them, but they didn't have many answers for me," said Gillespie on his role with the Giants. "He didn't know exactly what the move was or what it was for. At that point, I only knew I was going back up to the big leagues."

In order to make room for Gillespie on the active roster, San Francisco optioned outfielder Juan Perez to Fresno. As Gillespie was previously not on the 40-man roster, the Giants transferred injured outfielder Angel Pagan from the 15-day to the 60-day disabled list.

While it's Gillespie's first stint with the Giants, he does have previous experience at the Major League level. He spent parts of the 2010 and 2011 seasons with the D-backs, but missed all of last year with a hip injury.

"You can't take it for granted because you don't know when you're going to get that shot," Gillespie said. "There were two outfielders [Perez and Francisco Peguero] called up before me and obviously I still had to take care of my own business and not really dwell on that. So when I heard the news I was pretty ecstatic."

With left-hander Hyun-Jin Ryu on the mound for the Dodgers on Friday, manager Bruce Bochy put the right-handed Gillespie in the starting lineup at left field.

"I think [previous National League West experience] can help, being that I've played here before," Gillespie said. "Anytime you go into a new yard it takes a little adjustment time and I know in San Fran going out and playing in that right field the first time, it gave me a little bit of a headache with the wall and the wind. Hopefully in left field it's a little more comfortable for me."

Perez, who turned many heads in early June with dazzling plays in the outfield after earning a callup, simply wasn't producing at the plate in recent weeks and heads back to Fresno with a .238 average.

"I was wondering [if I would be demoted] yesterday because Gillespie got called up," Perez said. "I need to get better every single day. I've got to go down there and get at-bats every day and get back up here and help the team win again."

Worth noting

• Bochy said pitcher Chad Gaudin will be ready to start Sunday afternoon in the series finale against the Dodgers. Gaudin suffered an upper forearm bruise on his right arm during the last homestand and was placed on the disabled list June 24, retroactive to June 21.

• The Dodgers and Giants both entered the series under .500, and neither can exit it with an even record, even with a sweep. When San Francisco hosted Los Angeles last July, the clubs entered the series in first and second, respectively.

• The Giants have mustered just seven hits the past three games. According to the Elias Sports Bureau, only one other time has the club produced a total that low since moving to San Francisco: April 18-21, 1978.

Andrew Owens is an associate reporter for MLB.com. Follow him on Twitter @OwensAndrew. This story was not subject to the approval of Major League Baseball or its clubs.