Washington Nationals reliever Daniel Hudson has been placed on the postseason paternity list and won't be available to pitch at the beginning of the NL Championship Series against St. Louis.

Right-hander Wander Suero will be on Washington's active roster until Hudson returns. Hudson, who has two saves and a win during the playoffs, is allowed to be away from the team for a minimum of one day and a maximum of three days. When he rejoins the Nationals, he will take Suero's spot.

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Washington Nationals relief pitcher Daniel Hudson, left, celebrates after Los Angeles Dodgers' Corey Seager struck out to end Game 2 of a baseball National League Division Series on Friday, Oct. 4, 2019, in Los Angeles. (AP PhotoMark J. Terrill)

Washington Nationals reliever Daniel Hudson has been placed on the postseason paternity list and won't be available to pitch at the beginning of the NL Championship Series against St. Louis.

Washington Nationals relief pitcher Daniel Hudson (44) celebrates the final out of Game 4 of a baseball National League Division Series against the Los Angeles Dodgers, Monday, Oct. 7, 2019, in Washington. (AP PhotoAlex Brandon)

Hudson's absence weakens a shaky Nationals bullpen that had the worst ERA in the National League at 5.66. The right-hander went 3-0 with a 1.44 ERA and six saves in 24 regular-season appearances for Washington after he was acquired from Toronto at the July 31 trade deadline. He's pitched in four playoff games against Milwaukee and the Los Angeles Dodgers, throwing 3 2/3 scoreless innings.

Washington Nationals relief pitcher Daniel Hudson, left, celebrates after Los Angeles Dodgers' Corey Seager struck out to end Game 2 of a baseball National League Division Series on Friday, Oct. 4, 2019, in Los Angeles. (AP PhotoMark J. Terrill)

Washington Nationals relief pitcher Daniel Hudson, left, celebrates after Los Angeles Dodgers' Corey Seager struck out to end Game 2 of a baseball National League Division Series on Friday, Oct. 4, 2019, in Los Angeles. (AP PhotoMark J. Terrill)

Washington Nationals relief pitcher Daniel Hudson celebrates the final out of Game 4 of a baseball National League Division Series against the Los Angeles Dodgers, Monday, Oct. 7, 2019, in Washington. (AP PhotoJulio Cortez)

Washington Nationals relief pitcher Daniel Hudson celebrates the final out of Game 4 of a baseball National League Division Series against the Los Angeles Dodgers, Monday, Oct. 7, 2019, in Washington. (AP PhotoJulio Cortez)

Washington Nationals relief pitcher Daniel Hudson celebrates after the final out in Game 2 of the baseball team's National League Division Series against the Los Angeles Dodgers on Friday, Oct. 4, 2019, in Los Angeles. The Nationals won 4-2. (AP PhotoMark J. Terrill)

Washington Nationals relief pitcher Daniel Hudson celebrates after the final out in Game 2 of the baseball team's National League Division Series against the Los Angeles Dodgers on Friday, Oct. 4, 2019, in Los Angeles. The Nationals won 4-2. (AP PhotoMark J. Terrill)

Major League Baseball approved the roster substitution and announced it Friday, hours before Game 1 in the best-of-seven series at Busch Stadium.

Washington Nationals relief pitcher Daniel Hudson, left, celebrates after Los Angeles Dodgers' Corey Seager struck out to end Game 2 of a baseball National League Division Series on Friday, Oct. 4, 2019, in Los Angeles. (AP PhotoMark J. Terrill)

Washington Nationals relief pitcher Daniel Hudson, left, celebrates after Los Angeles Dodgers' Corey Seager struck out to end Game 2 of a baseball National League Division Series on Friday, Oct. 4, 2019, in Los Angeles. (AP PhotoMark J. Terrill)

Hudson's absence weakens a shaky Nationals bullpen that had the worst ERA in the National League at 5.66. The right-hander went 3-0 with a 1.44 ERA and six saves in 24 regular-season appearances for Washington after he was acquired from Toronto at the July 31 trade deadline. He's pitched in four playoff games against Milwaukee and the Los Angeles Dodgers, throwing 3 2/3 scoreless innings.

Suero was 6-9 with a 4.54 ERA and one save this season.

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Washington Nationals relief pitcher Daniel Hudson (44) celebrates the final out of Game 4 of a baseball National League Division Series against the Los Angeles Dodgers, Monday, Oct. 7, 2019, in Washington. (AP PhotoAlex Brandon)

Washington Nationals relief pitcher Daniel Hudson (44) celebrates the final out of Game 4 of a baseball National League Division Series against the Los Angeles Dodgers, Monday, Oct. 7, 2019, in Washington. (AP PhotoAlex Brandon)

Washington Nationals relief pitcher Daniel Hudson, left, celebrates after Los Angeles Dodgers' Corey Seager struck out to end Game 2 of a baseball National League Division Series on Friday, Oct. 4, 2019, in Los Angeles. (AP PhotoMark J. Terrill)

Washington Nationals relief pitcher Daniel Hudson, left, celebrates after Los Angeles Dodgers' Corey Seager struck out to end Game 2 of a baseball National League Division Series on Friday, Oct. 4, 2019, in Los Angeles. (AP PhotoMark J. Terrill)

Washington Nationals relief pitcher Daniel Hudson celebrates the final out of Game 4 of a baseball National League Division Series against the Los Angeles Dodgers, Monday, Oct. 7, 2019, in Washington. (AP PhotoJulio Cortez)

Washington Nationals relief pitcher Daniel Hudson celebrates the final out of Game 4 of a baseball National League Division Series against the Los Angeles Dodgers, Monday, Oct. 7, 2019, in Washington. (AP PhotoJulio Cortez)

Washington Nationals relief pitcher Daniel Hudson celebrates after the final out in Game 2 of the baseball team's National League Division Series against the Los Angeles Dodgers on Friday, Oct. 4, 2019, in Los Angeles. The Nationals won 4-2. (AP PhotoMark J. Terrill)

Washington Nationals relief pitcher Daniel Hudson celebrates after the final out in Game 2 of the baseball team's National League Division Series against the Los Angeles Dodgers on Friday, Oct. 4, 2019, in Los Angeles. The Nationals won 4-2. (AP PhotoMark J. Terrill)