PHOENIX -- Right-hander Kevin Correia will make his first Minor League injury rehabilitation start Friday with Class A San Jose, and might need only one more after that to prove he's ready to rejoin the Giants' starting rotation, manager Bruce Bochy said Tuesday.

Correia, who went on the disabled list April 27 with a strained muscle in his left side, prepared himself by pitching two innings Monday in an extended Spring Training game at the Giants' Minor League complex in nearby Scottsdale.

"It's still not 100 percent," Correia said, "but that's the way it is for a while if you pull a muscle. It's not unmanageable."

Right-hander Merkin Valdez (strained right elbow), who became eligible to leave the 15-day disabled list Tuesday, also continued to progress. The reliever, who hasn't pitched since May 12, made 45 throws on flat ground and threw 20 pitches off a Chase Field bullpen mound. The Giants will see how Valdez's arm feels Wednesday before determining his next step.

Infielder Kevin Frandsen, who's expected to miss the entire season with an injured left Achilles tendon, has begun walking under controlled conditions.

"It's tight, but it feels great," he said.