SAN FRANCISCO -- Outfielder Dave Roberts, who has appeared in only six games this season, is expected to begin a Minor League injury rehabilitation assignment Monday with the Giants' Triple-A Fresno affiliate.
Roberts, 36, has steadily worked his way back from arthroscopic left knee surgery he underwent on April 12. The Opening Day left fielder has lost his position to Fred Lewis, creating a potential personnel glut for the Giants when Roberts returns.
"Those things have a way of working themselves out," manager Bruce Bochy has repeated.
Roberts was batting .118 (2-for-17) before being sidelined.
First baseman-outfielder Daniel Ortmeier, recovering from a fractured left middle finger, is also poised to go on injury rehab Sunday with either Fresno or Class A San Jose. Ortmeier batted .219 in 38 games before being injured on May 29.
Bochy said that right-hander Merkin Valdez, who strained his throwing elbow in May, is expected to throw off a bullpen mound Friday, and will report to the Giants' training facility in Scottsdale, Ariz., while the team travels to New York and Chicago next week. The Giants bullpen has missed Valdez, who was 1-0 with a 1.69 ERA in 17 appearances before being sidelined.
Chris Haft is a reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.