SCOTTSDALE, Ariz. -- An injured oblique has sidelined Giants outfielder Andres Torres for a week and will prevent him from participating for Puerto Rico in the World Baseball Classic.

Manager Bruce Bochy added Thursday that left-hander Jose Mijares' playing status for Venezuela in the Classic is "doubtful" after reporting a tender throwing elbow, which the Giants officially called a posterior impingement.

The switch-hitting Torres' painful side has limited his ability to bat right-handed. An MRI confirmed Torres' ailment. He had appeared in two Cactus League games, most recently Tuesday against the Dodgers, and was 1-for-2 overall this spring.

Mijares allowed two runs and three hits while pitching the eighth inning in Wednesday's Cactus League game against the Angels. Mijares pitched a scoreless inning in his only other Cactus League appearance.

Torres had been expected to provide depth for Puerto Rico, while Mijares was projected for a bullpen role with Venezuela. Both players were due to leave Giants camp for their respective Classic teams this weekend.

Both are projected to make the Giants' Opening Day roster, but the club has an ample number of potential replacements if either player has to begin the season on the disabled list.

The Giants still have a sizable eight-man contingent bound for the 16-team international tournament: left-hander Jeremy Affeldt and right-hander Ryan Vogelsong (United States), third baseman Pablo Sandoval and second baseman Marco Scutaro (Venezuela), outfielder Angel Pagan (Puerto Rico), right-hander Santiago Casilla (Dominican Republic), right-hander Sergio Romo (Mexico) and Minor League catcher Tyler LaTorre (Italy).

Knee not an issue in Cain's second spring start

SCOTTSDALE, Ariz. -- Matt Cain pitched three innings Thursday against the Seattle Mariners, showing no ill effects from the bruised right knee that he sustained in his previous outing.

A comebacker hit by Alfonso Soriano of the Chicago Cubs struck Cain in the knee last Sunday, limiting the Giants right-hander to one inning. This time, he displayed decent stamina for this juncture of the spring in the Giants' 4-3 Cactus League loss, throwing 42 pitches.

Cain said that his location and rhythm were erratic, accounting for the three runs and four hits he allowed.

No batted balls passed near Cain this time, unlike last Sunday. This prompted Cain to joke, "We were starting to wonder if we were going to put an L-screen out there when I pitch."

Cain is scheduled to start San Francisco's regular-season opener at Los Angeles on April 1.

Worth noting

• Bochy seized his last opportunity until late March to field the Giants' probable Opening Day lineup Thursday. This weekend, regulars such as Angel Pagan, Pablo Sandoval and Marco Scutaro will take off to participate in the World Baseball Classic. The finals are scheduled for March 19 in San Francisco.

• Kensuke Tanaka singled to center field in the eighth inning Thursday against Seattle, ending an 0-for-10 skid in Cactus League play. "I know he's been pressing to get it," Bochy said of the utility infielder's first hit.

• Bochy sounded impressed by left-hander Dan Runzler, who struck out two in a scoreless sixth inning Thursday. Bothered for much of last season by a strained latissimus dorsi muscle, Runzler could intensify his bid for a spot on the Opening Day roster if Mijares is sidelined for a prolonged period.

• Shortstop Joe Panik, San Francisco's first-round selection in the 2011 Draft, has not appeared in a Cactus League game due to a right hamstring injury. Panik has been undergoing treatment and might be able to take batting practice Saturday.