Draft and minor leagues The
San Francisco Giants selected Krook in the fourth round, with the 125th overall selection, of the
2016 Major League Baseball draft. Krook signed with the Giants, was assigned to the rookie-level
Arizona League Giants, and was later promoted to the Low-A
Salem-Keizer Volcanoes. He posted a combined 1–4 record with a 5.53 ERA in 13 games (11 starts) between both teams. He spent 2017 with the High-A
San Jose Giants where he went 4–9 with a 5.12 ERA in 25 games (17 starts). On December 20, 2017, the Giants traded Krook,
Christian Arroyo,
Denard Span, and
Stephen Woods Jr. to the
Tampa Bay Rays in exchange for
Evan Longoria and cash considerations. Krook spent the 2018 season with the Double-A
Montgomery Biscuits, pitching to a 4–2 record with a 4.26 ERA in 37 games (six starts). He returned to Montgomery to begin 2019. In 32 appearances (18 starts) for the Biscuits, Krook registered a 2–3 record and 4.50 ERA with 52 strikeouts in 50 innings pitched. He did not play in a game in 2020 due to the cancellation of the minor league season because of the
COVID-19 pandemic. On December 10, 2020, the
New York Yankees selected Krook from the Rays in the minor league phase of the
Rule 5 draft. He began the 2021 season with the Double-A
Somerset Patriots and was promoted to the Triple-A
Scranton/Wilkes-Barre RailRiders during the season. He started for Scranton/Wilkes-Barre on
Opening Day of the 2022 season. Krook had a 10–7 record and a 4.09 ERA for the RailRiders in 2022. His 155 strikeouts set a new franchise record for a season which was previously held by
Carlton Loewer since 1997. On November 10, 2022, the Yankees added Krook to their
40-man roster to protect him from the
Rule 5 draft. Krook was optioned to Triple-A Scranton/Wilkes-Barre to begin the 2023 season. He transitioned into a
relief pitcher in 2023. In 12 games, Krook registered a 1.04 ERA with 34 strikeouts in innings pitched.
New York Yankees (2023) On May 27, 2023, Yankees promoted Krook to the major leagues for the first time. He went unused out of the Yankees
bullpen and was optioned to Triple-A Scranton on June 1, becoming a
phantom ballplayer. On June 8, Krook was recalled after
Nestor Cortés was placed on the injured list. On June 16 at
Fenway Park, Krook made his major league debut. In four games for the Yankees, he pitched to a 24.75 ERA with three strikeouts across four innings pitched. On February 13, 2024, Krook was
designated for assignment following the waiver claim of
Jordan Groshans.
Baltimore Orioles (2024) On February 18, 2024, the Yankees traded Krook to the
Baltimore Orioles for cash considerations. He was optioned to the Triple-A
Norfolk Tides to begin the 2024 season. He was recalled by the Orioles when
Corbin Burnes was placed on the paternity list on June 28. He returned to the Tides after surrendering a
Wyatt Langford three-run homer in the eighth inning of an 11–2 loss to the
Texas Rangers on June 30. Krook was designated for assignment by the Orioles on July 30. He cleared waivers and was sent outright to Norfolk on August 2. Krook elected free agency following the season on November 4.
Athletics (2025) On November 15, 2024, Krook signed a minor league contract with the
Athletics. He made 12 appearances for the Triple-A
Las Vegas Aviators, posting a 3-1 record and 3.21 ERA with 21 strikeouts over 14 innings of work. On May 16, 2025, the Athletics selected Krook's contract, adding him to their active roster. In three appearances for the team, he recorded a 5.40 ERA with three strikeouts across innings pitched. Krook was designated for assignment by the Athletics on May 27.
Cleveland Guardians On May 29, 2025, Krook was claimed off waivers by the
Cleveland Guardians. He made 30 appearances for the Triple-A
Columbus Clippers, posting a 2-0 record and 3.18 ERA with 40 strikeouts over 34 innings of work. On November 6, Krook was removed from the 40-man roster and sent outright to Columbus; he subsequently rejected the assignment and elected free agency.
Athletics (second stint) On November 22, 2025, Krook signed a minor league contract with the
Athletics. ==See also==