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03/21/12 7:55 PM ET

Wang questionable for Opening Day roster

VIERA, Fla. -- Nationals manager Davey Johnson isn't optimistic about right-hander Chien-Ming Wang being put on the Opening Day roster because of a strained left hamstring.

After Wednesday's 3-2, 10-inning loss to the Braves, Johnson noted that Wang has a lot of bleeding inside the hamstring and missing just two weeks of action was optimistic. Wang said on Wednesday that he was hoping to play catch on Friday, but it's not known if that will be the case.

"He has a lot of bleeding in there," Johnson said. "He is moving around, walking well. But when I saw him today, he had quite a bit of blood in there. Before he gets anywhere, I would say three weeks, maybe more. I have to double check with the doctors, but I saw a lot of blood in there. He can throw, but I don't see him getting on the mound. I was surprised by all the bleeding I saw."

Wang hurt his hamstring last Thursday against the Yankees. With no score and one out in the third inning, Yankees catcher Russell Martin hit a soft ground ball toward first base. Wang fielded the ball and fell down awkwardly after an initial misstep, then collided with Martin while coming across the base.

With Wang expected to be out of action to start the season, left-handers John Lannan or Ross Detwiler could be put in the rotation as the fifth starter. Lannan, who is on the trade block despite Wang's injury, pitched four shutout innings against the Braves and allowed three hits. He threw 79 pitches, 50 for strikes. It was an improvement from his previous outing in which he allowed four earned runs in four innings against the Yankees.

"I thought he threw the ball OK. He threw too many pitches," Johnson said about Lannan's start on Wednesday. "I thought he had good stuff, he had good sink. He had 70 pitches for four innings. That is not typical of Lannan. He pitched a lot better."

Detwiler, who has been pitching on the Minor League field of late, has pitched in three Major League exhibition games, allowing three runs in 7 2/3 innings. For now, he is slated to become a long reliever.

Johnson gets into 10th-inning pickle

VIERA, Fla. -- In the bottom of the 10th inning of a 3-2 loss to the Braves on Wednesday, Nationals manager Davey Johnson found himself in a bind.

The Nationals had runners on first and second with two outs. Johnson ran out of position players. He already told Mark DeRosa to go home, so Johnson had no choice but to let reliever Ryan Perry get the at-bat. Perry ended up striking out looking to end the game.

"It was a major screwup on my part for letting [DeRosa] go home," Johnson said. "I didn't want him to sit there for three hours and then have him go up there and take a chance in hurting his wrist."

Perry ended up pitching two innings and became the losing pitcher, but he was scheduled to pitch one. It turned out that left-hander Sean Burnett couldn't pitch because of back spasms and was sent home. The injury is not considered serious.

Marrero progressing, eager to see game action

VIERA, Fla. -- Nationals first baseman Chris Marrero is hoping to start playing extended Spring Training games by the end of April.

Marrero, who is ranked No. 11 by MLB.com on the Nationals' Top 20 Prospects list, has been recovering from a torn left hamstring, which he suffered while playing for the Licey Tigers of the Dominican Winter League.

Currently, Marrero can swing the bat in the cages with his teammates and can take ground balls. He has yet to run the bases, however. Marrero, a first-round pick in the 2006 First-Year Player Draft, made his Major League debut last season, hitting .248 with 10 RBIs and playing solid defense at first base.

"I want to get back on the field as soon as possible," Marrero said.

Storen OK after strep throat, pitching soreness

VIERA, Fla. -- Nationals closer Drew Storen said he is feeling much better after a bout with strep throat. He also said that he had normal pitching soreness that is not considered serious.

Storen has not pitched since March 7 against the Cardinals, but he played catch Wednesday. It's not known when Storen will play in an exhibition game.

"It was nothing huge," Storen said. "But we still have time. That's kind of the main thing -- seeing the big picture."

Bill Ladson is a reporter for MLB.com and writes an MLBlog, All Nats All the time He also could be found on Twitter @WashingNats. This story was not subject to the approval of Major League Baseball or its clubs.