WASHINGTON — Los Angeles Dodgers ace Clayton Kershaw won’t pitch this week against Washington because of nagging back pain.

Manager Dave Roberts says Kershaw will not come off the disabled list for the three-game set that began Tuesday.

It’s still uncertain when the three-time NL Cy Young Award winner will be activated. The left-hander has been out since June 27 because of mild disk herniation. He felt discomfort after a throwing session on Saturday.

“The next day he didn’t feel great,” Roberts said. “At that point in time that let us know we needed to be a little more on the cautious side. … Right now, with Clayton, I don’t know if it is a step back, but we’re going to let the back pain subside and see where it goes.”

Kershaw is 11-2 with an NL-leading 1.79 ERA.

ORIOLES: Outfielder Hyun Soo Kim was put on the 15-day DL because of a strained right hamstring, and Baltimore selected the contract of outfielder Julio Borbon from Double-A Bowie.

Kim, hitting .329 with 11 RBI in his rookie season, has not played since before the All-Star break.

GIANTS: San Francisco signed former first-round pick Kyle Drabek to a minor league deal.

San Francisco will give Drabek a look as a pitcher and possibly infielder, General Manager Bobby Evans told ESPN.

Drabek, 28, hasn’t pitched in the majors since April 7, when he threw two innings for Arizona.

Drabek, son of 1990 Cy Young Award winner Doug Drabek, signed out of high school with the Phillies in 2006 and was one of their top prospects when Philadelphia dealt him to Toronto in the trade for Roy Halladay in 2009.

Drabek has undergone two elbow reconstruction surgeries and played parts of seven seasons in the majors with the Blue Jays, White Sox and Diamondbacks.

CARDINALS: Third baseman Jhonny Peralta is going back on the 15-day DL because of a strained ligament in his surgically repaired left thumb.