J Pat Carter/AP

Jayson Werth, who is eligible to come off the disabled list Saturday in San Diego, could begin a rehab assignment with Class A Potomac either Tuesday or Wednesday, Manager Davey Johnson said.

The Nationals placed Werth on the disabled list Saturday, retroactive to May 3, with a slight hamstring strain. Werth flew to New York today, Johnson said, to meet with a personal doctor.

With Werth out this week, Johnson plans to use a platoon of Steve Lombardozzi, tonight’s starter, and Tyler Moore in left field. “That worked out fairly well,” Johnson said. “I might go back to that for the next few days.”

In Los Angeles, Moore had memories of his major league debut. The day after Bryce Harper arrived in the major leagues at Dodgers Stadium, Moore came up from Class AAA Syracuse.

Harper’s debut was more heralded, of course, but Moore’s may have been more dramatic. Mark DeRosa landed on the disabled list with an oblique strain, and at 12:30 in the morning, Moore learned he would be flying to Los Angeles for his debut. He arrived at the park at noon on a Sunday, about an hour before game time, assuming he would be sitting on the bench.

Then he learned Werth had a migraine and he would be starting in left field – a position he had played twice in his life.

“I walked in here and Werth was like, ‘I’m not playing,’ ” Moore recalled today. “I’m like, ‘Hold up. I didn’t even sleep! I’m going to play my first big league game like this?’ I figured the first time, I would be all prepared. Nope. Didn’t do it like that. It was good, though. I didn’t have time to think about anything else.”