The Nationals selected one player and lost one in the Winter Meetings closing event.
Brian Goodwin, A.J. Cole, Wilmer Difo, Matt Grace and Matt Skole are among the players eligible for Rule 5 draft protection.
Because of a full major league roster, the Nationals don't make a pick in the major league portion of the draft.
The Nationals must decide which players they will protect from the Rule 5 draft by Wednesday at midnight.
The Nationals opt not to pick any players in Thursday's Rule 5 draft and instead lose four, including speedster Kobernus and lefty Rosenbaum.