Ohlendorf had to leave Thursday's game with back spasms, but it's not considered to be serious. Manager Matt Williams said the team doesn't believe there are any structural issues with Ohlendorf's back.
Ohlendorf posted a 3.28 ERA in 60 1/3 innings last year.
Doug Fister was expected to start, but is dealing with some elbow inflammation. The injury is not considered serious. Roark is competing for a job at the back end of the team's rotation. He posted a 1.51 ERA in 53 2/3 innings last year.
Janssen is dealing with some shoulder tenderness, but the team doesn't think it's serious. He was shelved for a few days, but has resumed throwing. Janssen is expected to open the season as the team's closer as long as he's healthy.
He posted a 2.56 ERA in 52 2/3 innings last year.
Gonzalez signed with the club Tuesday. He said he had offers from four other teams, but wanted to sign with the Nationals because he felt they were closest to winning a ring. He posted a 4.68 ERA in 50 innings last year.
Motte is recovering from Tommy John surgery, but is said to be ahead of schedule. Despite his progress, it's tough to know if Motte will be ready to go by opening day. Motte posted a 2.75 ERA in 72 innings in 2012.
Parnell is slated to make his spring debut Monday. He's been recovering from offseason neck surgery, but was able to throw in an intrasquad game Thursday. Parnell did not experience a setback after the appearance, and has been cleared to move forward in his rehab.
Parnell posted a 2.16 ERA in 50 innings last year.
Manager Matt Williams told the paper that Ohlendorf experienced lower back spasms when he faced his first batter. He allowed two runs on three hits and one walk without retiring a batter in the sixth inning. He'll be re-evaluated in the morning on Friday.
Parnell tossed one scoreless inning during an intrasquad game. Parnell said "everything felt good," and that his arm was "strong." Parnell is attempting to come back from neck surgery. He posted a 2.16 ERA in 50 innings last year.