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Nationals Roster Updates: Blake Treinen up, Aaron Barrett To Triple-A, Steven Souza, Jr up...?

Reporters in Atlanta tonight saw some new faces in the visiting clubhouse in Turner Field. The Washington Nationals haven't made anything official yet, but it looks like a lot of work and some banged up players have led to Blake Treinen and Steven Souza being called up...

David Manning-USA TODAY Sports

With some tired relievers in the bullpen and some injury issues in the outfield, the Washington Nationals have reportedly shuffled things up a bit this afternoon.

According to reports from Atlanta, where the Nationals are preparing to take on the Braves in the second game of a three-game weekend set, the Nats have made several roster moves to address their needs.

"He had a little groin tweak tonight, so we decided it was best to get him out of there..." - Matt Williams on Jayson Werth after last night's loss in ATL

The first appears to be a swap of relievers with 25-year-old right-hander Blake Treinen getting a call up from Triple-A Syracuse and righty Aaron Barrett getting sent down so the Nationals can have a "fresh" arm in the pen.

Barrett, 26, has already made six appearances this season, giving up a hit and two walks in 4 1/3 IP over which he's struck out six batters.

Treinen and Barrett were surprise contenders for the last spot in the Nationals' bullpen this spring.

In five innings with the Nats' top affiliate so far, Treinen, the former Oakland A's prospect acquired last winter in the three-team deal that sent Michael Morse to the Mariners, has given up three hits, two walks and two unearned runs.'s Mark Zuckerman wrote on Twitter in the last hour that Treinen was informed of the team's plans last night:

There also appears to be something going on in the outfield with Jayson Werth out of the starting lineup after he was pulled late last night with a tight groin.

• Here's tonight's lineup:

Nats' skipper Matt Williams told reporters last night that Werth's groin tightened up so he left the game early.

"He had a little groin tweak tonight," Williams said. "So we decided it was best to get him out of there and reevaluate tomorrow, but a little bit of tightness."

While Werth is reportedly listed on the lineup card, Denard Span is not:

Span collided with Dan Uggla while rounding first on his RBI single in the eighth last night, but the Nats' center fielder stayed in the game and Williams said afterwards there were no problems.

"He's fine," Williams said last night. "Uggla's okay too, I asked Danny."

No word on what if anything is wrong with Span, but we'll update after Williams talks to the press before tonight's game...