David Carpenter. (Brad Mills-USA TODAY Sports)

Even before the second half began, the banged-up National suffered another blow. Veteran reliever David Carpenter landed on the disabled list Friday with right shoulder inflammation. The move is retroactive to July 12. To take his place, the Nationals recalled left-handed reliever Sammy Solis from Class AA Harrisburg.

Carpenter first felt the issue before the all-star break when he warmed up in the second game of the Baltimore but felt something in his arm and Casey Janssen appeared in the game instead. He hasn’t pitched since July 5 and missed a few games while on paternity leave. Carpenter thought the four-day all-star break would help his shoulder but it didn’t feel right during Thursday’s workout.

“Shoulder is just barking,” he said. “It’s kinda one of those normal things you go through right now. It’s disappointing I had to have them do this but sometimes just have to get everything back to normal and get ready for this run we’re about to go on. That’s the way I’m looking at it.”

Carpenter said he considered the inflammation as result of normal wear and tear.

“Just have to get back on doing all the little exercises a little bit more to make sure everything is where it needs to be,” he said.

[Good news — Nats don’t need to get healthy to win the East]

Carpenter was emerging as a solid setup option. The Nationals acquired the hard-throwing right-hander in a trade last month, and he allowed one run in six innings spread over eight appearances. Solis has allowed five runs over 10 major league innings.

With Carpenter injured, the Nationals could likely rely heavily on Janssen and Matt Thornton as setup options. Depending on the severity, Carpenter’s injury could give the Nationals more motivation to seek outside relief help ahead of the July 31 non-waiver trade deadline. Carpenter joins eight other Nationals on the disabled list.

“Rather than play [a reliever] short we can retro him back to the 12th [of July],” Manager Matt Williams said. “He’s already a few days in and we want to make sure.”