SCOTTSDALE, Ariz. -- Ryan Vogelsong's strained back left the Giants with few reinforcements in case another starting pitcher is sidelined. But some depth does exist.

The most experienced starter among San Francisco's non-roster invitees is right-hander Ramon Ortiz, who's 86-84 with a 4.93 ERA in 11 Major League seasons. Ortiz has started in 214 of his 296 big league appearances. Last year, he finished 1-2 with a 4.86 ERA in 22 games for the Chicago Cubs and went 6-3, 4.26 in 16 starts at Triple-A Iowa.

Left-hander Brian Burres, who began his professional career with the Giants, also is in camp as a non-roster invitee. Burres owns an 18-25 record with a 5.75 ERA in 105 games (56 starts) spanning parts of six Major League seasons. He's 60-47 with a 4.06 ERA in 11 years in the Minors.

Right-hander Shane Loux compiled a 3-7 mark with a 6.14 ERA in parts of four seasons with Detroit (2002-03) and the Angels (2008-09). He has made 13 starts in 39 Major League appearances. Loux finished 8-12, 4.67 in 28 games with Triple-A Fresno last year.

Left-hander Matt Yourkin, who shared Fresno's team lead in victories last season by finishing 10-8 with a 4.69 ERA, would be considered another option. The Napa, Calif., native is 33-36 with a 4.19 ERA in eight Minor League seasons.

The Giants are hoping that Vogelsong, who could be sidelined from 10 days to two weeks, will recover quickly. He received complete, if unwanted, rest Monday when he felt ill and was sent home.

"Vogelsong is getting done with all his issues early in camp," manager Bruce Bochy said jokingly.

Left-hander Eric Surkamp is the leading candidate to start if Vogelsong is shelved for a prolonged period.

Lopez missing personal barber in Ramirez

SCOTTSDALE, Ariz. -- Having sported close-cropped hair as a Giant, left-hander Javier Lopez reported to camp resembling a fifth Beatle.

Blame the trade last December that sent right-hander Ramon Ramirez and outfielder Andres Torres to the New York Mets for outfielder Angel Pagan.

Lopez explained that Ramirez trimmed hair when he wasn't throwing in the bullpen. He gave Lopez a final once-over as last season ended. Lopez said that he allowed his hair to grow during the offseason and was awaiting a Spring Training session with his personal barber. Of course, Lopez had no idea as the winter began that Ramirez would be dealt.

Lopez now has no choice but to seek a new stylist.

"It's tough to get a flight to Port St. Lucie [the Mets' spring home in Florida] and get back in time for the workout," Lopez said.

Worth noting

• Bochy said Monday that the Giants likely will conduct an intrasquad game March 1. Typically, intrasquad games are showcases for rookies and non-roster players. Veterans rarely participate.

• As expected, Buster Posey was excused from catching pitchers' bullpen throwing sessions Monday but participated fully in the rest of the workout. Bochy said that Posey will catch in the bullpen Tuesday.

• Outfielder Nate Schierholtz joined the contingent of position players who have arrived in camp early. That group includes Ehire Adrianza, Emmanuel Burriss, Brandon Crawford, Charlie Culberson, Brett Pill and Roger Kieschnick. Reporting day for position players is Thursday, with the first full-squad workout to follow Friday.

• Interestingly, rookie right-hander Heath Hembree, considered the Giants' closer of the future, threw his bullpen session next to the present closer, Brian Wilson. With a flock of coaches watching, there was no danger of one pitcher trying to overwhelm the other, and certainly not with Wilson committed to throwing at less than full speed. Still, said Bochy, "The last thing you want is to have them compete in the first bullpen to see who throws the hardest."