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5/28/2013 9:27 P.M. ET

Surgery completed on Casilla's right leg

OAKLAND -- Right-hander Santiago Casilla had successful surgery to remove a cyst from his right tibia Tuesday.

Giants manager Bruce Bochy said he'll have a better idea of how much time Casilla will miss when he talks to the medical staff.

Casilla said Monday that his knee has been sore for more than a year and he's been able to pitch through it.

MRI reveals only bursitis in Pagan's hamstring

OAKLAND -- Angel Pagan underwent an MRI on his strained left hamstring Tuesday, and Giants manager Bruce Bochy said the news was good.

"There's some bursitis in there and it's a little sore," Bochy said before Tuesday's Interleague game vs. the A's. "We'll see how he gets through his workouts to determine if he's available as a pinch-hitter."

Pagan suffered the strain Saturday, before his walk-off, inside-the-park home run.

Pagan brought the results of the MRI with him to Oakland and when asked about his status, he waved the folder and said, "We'll see."

Pagan, who participated in pregame activities, remains day to day with the injury.

Giants welcome rookie Kickham to clubhouse

OAKLAND -- It's officially Mike, as in Mike Kickham, the Giants' latest left-handed starter.

Kickham had first been introduced as Michael, but Giants media-relations manager Jim Moorehead did the investigative work to determine he prefers Mike.

Kickham walked into the visiting clubhouse in Oakland on Tuesday just before 4 p.m. PT, wearing a light green shirt. It didn't take long for him to switch to orange and black.

Nick Noonan, the only other Giants player to make his Major League debut this year, said his advice would be to "stay positive, go out and do your thing, just play your game."

Noonan was in the starting lineup Tuesday, as Marco Scutaro assumed the designated-hitter role.

"He just has to pitch the way he pitches and act like he belongs," Noonan said. "Everything will work out."

Kickham, who has an identical twin brother (Dan), was drafted by the Giants in the sixth round in 2010.

Dan Kickham, a right-hander, was also drafted in 2010, in the 37th round by the Colorado Rockies but did not sign. He played for the independent Kansas City T-Bones last summer.

Mike Kickham's theory on why the brothers throw with a different arm is that when they played together as babies, Mike mirrored Dan's movements, so when Dan moved his right hand, Mike moved his left hand.

"Today is going to be one of the biggest days in his life," Noonan said. "I'm sure he'll be in awe for a second and then realize he has a job to do."

Within minutes of his arrival, Kickham was greeted by, in order, Sergio Romo, Brett Pill, Barry Zito and Madison Bumgarner.

At 4:05 p.m., pitching coach Dave Righetti came out to talk with him, and at 4:09 p.m., catcher Buster Posey came over to chat.

Giants manager Bruce Bochy suggested Kickham will likely start again Sunday but didn't want to commit to anything further than Tuesday.

The Giants will not need a fifth starter between June 2-15, though there's a chance the starters will all get an extra day off.

Rick Eymer is a contributor to MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.