WASHINGTON — Stephen Strasburg was placed on the 10-day disabled list by the Washington Nationals, who want the standout right-hander to rest his elbow by missing a turn in the rotation.

The Nationals described the injury as a “right elbow nerve impingement.” The move, made Thursday, is retroactive to July 24.

Manager Dusty Baker said Strasburg “is not feeling right.”

Strasburg is 10-3 with a 3.25 ERA in 20 games. He was removed from his last start Sunday after two innings at Arizona.

Baker said Strasburg will continue to throw in the bullpen and pitch in a simulated game before the Nationals decide whether to bring him back.

RAYS-WHITE SOX: Tampa Bay acquired help for an inconsistent bullpen, obtaining left-handed reliever Dan Jennings from Chicago for minor league first baseman Casey Gillaspie.

Jennings was 3-1 with a 3.45 ERA in 48 appearances for the White Sox this season.

BRAVES: Atlanta optioned struggling shortstop Dansby Swanson to Triple-A Gwinnett.

Swanson was expected to be the figurehead of a rebuilding team. He was the No. 1 overall pick by Arizona in 2015 and was regarded as one of the National League’s top rookies. He has hit only .213 with six homers and 35 RBI. He has three hits in 25 at-bats since the All-Star break.

MARLINS: Manager Don Mattingly said third baseman Martin Prado’s injured knee has not progressed and season-ending surgery may be a possibility.

Mattingly said the team could make a decision as early as Friday.

RAYS-METS: New York started its veteran dispersal by trading first baseman Lucas Duda to Tampa Bay for minor league pitcher Drew Smith.

Duda is eligible for free agency after the season, as are Mets outfielders Curtis Granderson and Jay Bruce, second baseman Neil Walker, shortstop Asdrubal Cabrera, and relievers Addison Reed and Jerry Blevins.

TWINS-DIAMONDBACKS: Minnesota traded Triple-A catcher John Ryan Murphy to Arizona for Double-A left-hander Gabriel Moya.