Dodgers ace Clayton Kershaw said Friday his sore left foot bothers him when he runs that but it's not affecting his pitching.

"It's kind of progressively gotten worse over the last 10 days, two weeks," said Kershaw, who's suffering from plantar fasciitis, an inflammation of the thick tissue at the bottom of the foot.

"It's not going to stop me from pitching, it's just annoying," the left-hander said. "Throwing's fine, [it's] just running."

Asked if the foot had affected his pitching this season, Kershaw — 4-3 with a 2.55 earned-run average — replied flatly: "No."

The ailing foot was evident during Kershaw's last start Monday when he grimaced while running to first base.

Kershaw, last year's National League Cy Young Award winner, won't have to worry about running the bases during his start Saturday against the Mariners at Safeco Field; with the designated hitter rule in effect in an American League park, he is unlikely to bat.

"Kind of the peak of the pain was obviously running to first" Monday in Philadelphia, Kershaw said, but thanks to recent treatments "it's gotten better the last three or four days. Should be fine."