Triple-A Las Vegas placed Klein on its 7-day injured list Aug. 31 with an unspecified injury.
Acquired from the Royals at the trade deadline, Klein initially reported to Oakland and made three appearances for the big club before being optioned to the minors Aug. 17. He gave up three earned runs on six hits and five walks over 5.1 innings across four outings prior to landing on Las Vegas' IL.
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Athletics' Will Klein: Sent to Las Vegas
Rotowire
The Athletics optioned Klein to Triple-A Las Vegas on Saturday.
Klein gave up five earned runs on two hits and four walks while recording one strikeout in 1.2 innings across three appearances since the Athletics acquired him from the Royals at the deadline as part of the return for Lucas Erceg. The 24-year-old righty walks too many batters (16.3 percent walk rate at Triple-A, 15.8 percent walk rate in the majors) to work in high-leverage situations anytime soon.
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Royals' Will Klein: Moves up from Triple-A
Rotowire
The Royals recalled Klein from Triple-A Omaha on Monday.
Klein has permitted four runs over 5.2 relief innings during his time with the big club this season. The right-hander will operate in low-leverage spots out of the bullpen.
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Athletics' Will Klein: Acquired by Oakland
Rotowire
The Athletics acquired Klein, Jared Dickey and Mason Barnett from the Royals on Tuesday in exchange for Lucas Erceg, Mark Feinsand of MLB.com reports.
Klein has allowed four runs in 5.2 frames during his brief time in the majors this season. He's put up a 30.7 percent strikeout rate but also a 16.1 percent walk rate in the minors. Klein had been on the Royals' major-league roster, but it's not clear whether he'll report to Oakland or Triple-A Las Vegas.
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Royals' Will Klein: Sent back to Triple-A
Rotowire
The Royals optioned Klein to Triple-A Omaha on Monday.
Kansas City will swap Klein out of its bullpen for right-hander Dan Altavilla, whose contract was selected from Omaha ahead of Monday's game against the Yankees. Klein was unlikely to be available out of the bullpen for at least a couple of days anyway after he had given up two runs on six hits and two walks over 2.2 innings between relief appearances Friday and Sunday versus the Mariners.
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Royals' Will Klein: Picks up first big-league win
Rotowire
Klein (1-0) struck out one in a perfect inning to earn the win Sunday over the Padres.
Klein worked the ninth inning while the Royals were down 3-1, and they rallied for a walk-off win in their half of the frame. The rookie right-hander has displayed some promise with five strikeouts over his first three innings in the majors, though he's also allowed two runs and four hits. Klein figures to operate in a low-leverage role as long as he's on the Royals' 26-man roster. He's pitched to a 1.93 ERA, 0.95 WHIP and 23:14 K:BB over 23.1 innings at Triple-A Omaha this season, showing significant growth from 2023.
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Royals' Will Klein: Recalled from minors
Rotowire
Kansas City recalled Klein from Triple-A Omaha on Friday.
The 24-year-old righty will rejoin the Royals after being optioned down in late April, while southpaw Daniel Lynch gets sent down to Omaha in a corresponding move. Klein has seen just one inning with Kansas City this year and logged two strikeouts with no runs allowed.
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Royals' Will Klein: Sent back to minors
Rotowire
The Royals optioned Klein to Triple-A Omaha on Monday.
Klein struck out two in a scoreless inning Sunday versus the Tigers in what was his major-league debut. He eventually has a chance to play an important role in the Royals bullpen this season, but for now Klein, will head back to Omaha to make room for Monday's starter, Jonathan Bowlan, who was called up from Triple-A in a corresponding move.
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Royals' Will Klein: Summoned to majors
Rotowire
The Royals recalled Klein from Triple-A Omaha on Thursday.
Klein, 24, has allowed just one unearned run with a 12:6 K:BB over 11 innings this season with Omaha. The reliever will be making his major-league debut when/if he enters a game.
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Royals' Will Klein: Optioned to Triple-A
Rotowire
The Royals optioned Klein to Triple-A Omaha on Friday.
Klein was added to the Royals' 40-man roster in November after posting a 5.66 ERA and 1.85 WHIP across 35 innings in Triple-A last season. He struck out six batters over 3.2 scoreless frames during spring training, but he will need to prove he can find consistent success in the minors before getting the call to join Kansas City's bullpen.
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Royals' Will Klein: Selected to 40-man
Rotowire
The Royals selected Klein to their 40-man roster Tuesday.
Klein, 23, posted a 4.62 ERA and 93:39 K:BB in 64.1 innings of work this past year between Double-A Northwest Arkansas and Triple-A Omaha. The young reliever could make his MLB debut in 2024.
Klein (lower leg) was reinstated from Double-A Northwest Arkansas' 7-day injured list Saturday and started in the affiliate's 7-6 loss to Wichita later that day. He covered 1.1 innings, giving up four runs (three earned) on two hits and five walks while striking out one.
Klein had been sidelined for the first five weeks of the season while he dealt with shin splits, but he was cleared to debut at Northwest Arkansas over the weekend without having to complete a rehab assignment at a lower-level affiliate. In hindsight, the Royals may have wanted to give him a tune-up outing in the lower rungs of the minors, as he struggled mightily with both his command and control in his Double-A debut. Klein threw just 21 of his 45 pitches for strikes before he was lifted midway through the second inning.
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Royals' Will Klein: Nursing shin injury
Rotowire
Klein will be sidelined for the start of the minor-league season while he contends with shin splints, Anne Rogers of MLB.com reports.
News of Klein's injury first became available Monday, when the Royals didn't list him on any of the season-opening active rosters the organization released for its minor-league affiliates. The 22-year-old right-hander spent his first professional campaign at High-A Quad Cities, finishing with a 3.20 ERA, 1.24 WHIP and 121:44 K:BB across 70.1 innings.
