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Krook elected to enter free agency Wednesday after declining his outright assignment from the Nationals to Triple-A Rochester.
Krook was DFA'd by the Nationals on Monday, and rather than remain in the organization, the veteran southpaw will have the opportunity to explore his options. He's appeared in 11 major-league games between the Nationals and Athletics this season, allowing 11 runs (10 earned) on nine hits and 10 walks while striking out nine across 9.1 innings.
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Nationals' Matt Krook: Booted from 40-man roster
Rotowire
The Nationals designated Krook for assignment Monday.
Krook walked all three batters he faced and was charged with two runs in Sunday's win over the Diamondbacks, and he finds himself off the 26-man and 40-man rosters a day later. Paxton Schultz will absorb Krook's spot on the roster and in the bullpen.
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Nationals' Matt Krook: Back with Washington
Rotowire
The Nationals re-signed Krook to a major-league contract prior to Sunday's game against the Athletics.
Krook had elected free agency after rejecting an outright assignment to Triple-A Rochester when Washington removed him from its 40-man roster a week ago, but he quickly ended up returning to the Nationals on a new deal. The 31-year-old will give Washington another left-handed option in its bullpen after PJ Poulin (forearm) was placed on the 15-day injured list Sunday.
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Matt Krook: Elects free agency
Rotowire
The Nationals outrighted Krook to Triple-A Rochester on Tuesday, but he rejected that assignment and declared free agency.
The 31-year-old was designated for assignment by Washington over the weekend, and he'll hit the open market after passing through waivers unclaimed. In eight appearances between the Athletics and Nationals this season, Krook has surrendered nine earned runs with a 7:6 K:BB across 6.1 innings.
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Nationals' Matt Krook: Dropped from 40-man roster
Rotowire
The Nationals designated Krook for assignment Sunday.
Krook will be pushed off the 40-man roster after the Nationals recalled first baseman Abimelec Ortiz from Triple-A Rochester in a corresponding move. The lefty reliever has struggled over eight appearances in the big leagues this season between the Athletics and Nationals, pitching to a 12.79 ERA, 2.37 WHIP and 7:6 K:BB in 6.1 innings.
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Nationals' Matt Krook: Lands with Nats
Rotowire
Washington claimed Krook off outright waivers from the Athletics on Saturday.
Krook struggled during his time with the A's before being DFA'd on Friday, allowing seven earned runs with a 5:4 K:BB over 3.2 innings spanning five appearances. However, the Nationals will look to help him get back on track in order to utilize him as a lefty option out of the bullpen. To clear room for Krook, Washington designated righty hurler Andre Granillo for assignment and optioned right-hander Zak Kent to Triple-A Rochester.
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Athletics' Matt Krook: DFA'd by Athletics
Rotowire
The Athletics designated Krook for assignment Thursday.
Krook was roughed up for seven runs with a 5:4 K:BB over 3.2 innings during his brief time with the big club. The lefty has been outrighted previously, so he could elect free agency if he passes through waivers.
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Athletics' Matt Krook: Gets call to big leagues
Rotowire
The Athletics selected Krook's contract from Triple-A Las Vegas on Sunday.
The left-hander re-signed with the A's on a minor-league deal in November and failed to make the Opening Day roster, but he'll get a chance in the majors after posting a 3.72 ERA, 1.41 WHIP and 42:16 K:BB across 29 relief innings for Las Vegas. Krook has eight big-league appearances under his belt since debuting in 2023 and has struggled in that limited sample size, giving up 15 earned runs with an 8:8 K:BB.
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Athletics' Matt Krook: Falls short in bid for roster
Rotowire
The Athletics reassigned Krook to minor-league camp Sunday.
Krook was one of 11 players sent out in the Athletics' latest round of roster cuts. The 31-year-old left-hander spent most of the 2025 season at the Triple-A level but made three appearances in the majors with the Athletics, giving up two earned runs on five hits and one walk over 3.1 innings.
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Athletics' Matt Krook: Signs on with A's
Rotowire
Krook agreed to a minor-league contract with the Athletics on Saturday.
Krook elected free agency earlier in the month after being sent outright to Cleveland's Triple-A affiliate, and he's since decided to return to the A's. He made three appearances for the Athletics during the 2025 season, surrendering two runs on five hits and one walk while striking out three over 3.1 innings.
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Matt Krook: Headed to free agency
Rotowire
The Guardians outrighted Krook to Triple-A Columbus, and he elected free agency Thursday, Tim Stebbins of MLB.com reports.
Krook's only big-league appearances came with the A's in May, but he spent the final four months of the season in the Guardians' organization. He'll likely find a minor-league deal around the league this winter.
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Guardians' Matt Krook: Claimed by Guardians
Rotowire
The Guardians claimed Krook off waivers from the Athletics on Thursday and optioned him to Triple-A Columbus, Tim Stebbins of MLB.com reports.
Krook was pushed off the Athletics' 40-man roster Tuesday after allowing two runs in 3.1 innings. He owns a 3.21 ERA in 14 Triple-A frames this season, however, and he'll now attempt to work his way back into the big leagues with Cleveland. Ben Lively (elbow) was transferred to the 60-day IL to make room for Krook on the 40-man.
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Athletics' Matt Krook: Dumped from 40-man roster
Rotowire
The Athletics designated Krook for assignment Tuesday.
The left-hander was optioned to Triple-A Las Vegas on Thursday and has now lost his place on the 40-man roster. Krook will likely remain with Vegas if he passes through waivers unclaimed.
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Athletics' Matt Krook: Returns to Triple-A
Rotowire
The Athletics optioned Krook to Triple-A Las Vegas on Thursday.
Krook made three appearances during his short time with the big club, yielding two runs over 3.1 innings. Carlos Duran was called up from Triple-A in a corresponding move and will take Krook's spot in the bullpen.
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Athletics' Matt Krook: Selected from Vegas
Rotowire
The Athletics selected Krook's contract from Triple-A Las Vegas on Friday.
Krook signed a minor-league deal with the A's during the offseason and has since turned in a 3.21 ERA and 1.57 WHIP alongside a 21:8 K:BB across 14 innings in Triple-A. Searching for some answers in their bullpen, the Athletics will give the 30-year-old southpaw another look in the bigs. However, with 13 earned runs allowed in just five career MLB innings, Krook will almost certainly be limited to a low-leverage role.
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Athletics' Matt Krook: Catches on with Athletics
Rotowire
Krook signed a minor-league contract with the Athletics on Friday.
Krook surrendered two earned runs in one inning during his lone MLB appearance with Baltimore last season. He was much more effective during his time with Triple-A Norfolk, however, posting a 3.92 ERA and 1.41 WHIP across 43.2 frames. Now with the A's, the 30-year-old southpaw will most likely fill in as organizational depth at Triple-A Las Vegas.
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Orioles' Matt Krook: Outrighted to Triple-A
Rotowire
The Orioles outrighted Krook to Triple-A Norfolk on Friday, Roch Kubatko of MASNSports.com reports.
Krook was dropped from the 40-man roster earlier this week but will remain in the organization after passing through waivers unclaimed. He holds a 4.11 ERA and 1.43 WHIP with 41 strikeouts over 35 innings this season at Norfolk.
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Orioles' Matt Krook: Dropped from 40-man roster
Rotowire
Krook was designated for assignment by the Orioles on Tuesday, Rich Dubroff of BaltimoreBaseball.com reports.
Krook has spent the majority of 2024 campaign with Triple-A Norfolk, where he'll likely remain if he clears waivers. The left-hander owns a 4.11 ERA and 1.43 WHIP with 41 strikeouts over 35 innings in 34 appearances out of Norfolk's bullpen this year. With the Orioles acquiring a handful of players during Tuesday's trade deadline, Krook appears to have been one of the odd men out on the 40-man roster.
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Orioles' Matt Krook: Sent back to Norfolk
Rotowire
The Orioles optioned Krook to Triple-A Norfolk on Monday.
He'll head back to Triple-A to reopen a spot on the 26-man active roster for right-hander Corbin Burnes (personal), who was reinstated from the paternity list. During his three-day stay with the Orioles, Krook made his lone relief appearance in Sunday's 11-2 loss to the Rangers, giving up three runs (two earned) on one hit and one walk while striking out two over one inning.
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Orioles' Matt Krook: Summoned from Triple-A
Rotowire
The Orioles recalled Krook from Triple-A Norfolk on Friday.
Krook will supply some short-term depth for the Orioles' bullpen with Corbin Burnes hitting the paternity list. Krook hasn't appeared in an MLB game this season and owns a 3.71 ERA across 26.2 innings with Norfolk in 2024.
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