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The Royals recalled Kolek from Triple-A Omaha on Friday.
The right-hander was demoted to Omaha on Wednesday but will quickly rejoin the major-league club with Cole Ragans (elbow) landing on the injured list. Kolek made a spot start in place of Noah Cameron (back) earlier this week and could now get a few turns through the rotation with Ragans sidelined. Kolek delivered a quality start in his first MLB appearance of 2026, striking out three and giving up three runs on four hits over six innings while picking up a win versus Cleveland.
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Royals' Stephen Kolek: Collects win in 2026 debut
Rotowire
Kolek (1-0) picked up the win Tuesday against the Guardians, allowing three runs on four hits and no walks with three strikeouts across six innings.
After straining his oblique during spring training, Kolek made four rehab starts with Triple-A Omaha before he was summoned for his 2026 debut Tuesday in place of the injured Noah Cameron (back). Kolek doesn't have great stuff and generated just two whiffs on 83 pitches against Cleveland, but he throws six pitches with plus command and was able to keep the Guardians at bay. With Cameron tentatively expected to avoid a trip to the injured list, it's unclear if Kolek will remain in Kansas City's rotation.
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Royals' Stephen Kolek: Moving to Triple-A
Rotowire
The Royals optioned Kolek to Triple-A Omaha on Wednesday.
Kolek picked up the win in a spot start Tuesday versus the Guardians, yielding three runs on four hits and no walks with three strikeouts across six innings. With Kolek back in the minors, Noah Cameron (back) seems destined to rejoin the rotation after missing just one start.
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Royals' Stephen Kolek: Activated ahead of Tuesday's start
Rotowire
The Royals activated Kolek (oblique) from the 15-day injured list Tuesday.
Kolek is set to make his season debut for the Royals with a start Tuesday versus the Guardians, slotting in as a replacement for Noah Cameron (back). Out since spring training with an oblique strain, Kolek posted a 2.76 ERA and 14:4 K:BB over 16.1 innings in four rehab starts with Triple-A Omaha. He threw 72 pitches in his final rehab appearance, so he could be limited slightly from a workload perspective Tuesday.
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Royals' Stephen Kolek: Will be activated to start Tuesday
Rotowire
The Royals announced that Kolek (oblique) will be activated from the 15-day injured list to start Tuesday's game against the Guardians.
Kolek completed his fourth rehab appearance at Triple-A Omaha on Wednesday, striking out four batters over 4.1 innings (72 pitches) while yielding three runs (one earned) on eight hits and no walks. Though he initially appeared to be ticketed for a long-relief role upon his return from the IL, Kolek will end up slotting into the rotation Tuesday as a rpelacement for Noah Cameron, who was scratched from his scheduled start due to lower-back tightness. Kolek suffered a Grade 1 left oblique strain during spring training and will be making his first big-league appearance of the 2026 campaign Tuesday.
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Royals' Stephen Kolek: Completes fourth rehab start
Rotowire
Kolek (oblique) allowed three runs (one earned) on eight hits and no walks across 4.1 innings with Triple-A Omaha on Wednesday. He struck out four.
Kolek made his fourth rehab start with Triple-A Omaha as he builds back from a Grade 1 left oblique strain suffered in spring training. The right-hander allowed his highest hit total of the rehab assignment Wednesday, though it also marked his first outing without issuing a walk. Across four starts at Triple-A, the 28-year-old owns a 2.76 ERA and 1.41 WHIP with a 14:4 K:BB in 16.1 innings. Kolek appears to be nearing the end of his rehab assignment and is on track to be activated soon, though he could remain at Triple-A upon activation with no clear opening in the Royals' rotation.
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Royals' Stephen Kolek: Scoreless effort in rehab outing
Rotowire
Kolek (oblique) allowed no runs on three hits and a walk over four innings during a rehab start with Triple-A Omaha on Tuesday. He struck out two.
Kolek made the first start of his rehab assignment as he works his way back from a Grade 1 left oblique strain suffered in spring training. The right-hander threw 54 pitches (36 strikes) and maintained a fastball velocity of 94.3 mph, in line with his previous levels. The 28-year-old should continue to build up his workload for another couple rehab outings before being activated from the injured list, though he may be ticketed to remain at Triple-A upon activation with no clear opening in the big-league rotation.
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Royals' Stephen Kolek: Cleared for rehab assignment
Rotowire
Kolek (oblique) will begin a rehab assignment with Triple-A Omaha on Sunday, Anne Rogers of MLB.com reports.
Kolek suffered a left oblique strain in late February and has finally been cleared to pitch in games again. He will need at least a couple rehab outings before being an option for the Royals' rotation or bullpen.
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Royals' Stephen Kolek: Ramping up in extended spring
Rotowire
Kolek (oblique) threw three innings and 49 pitches Thursday during a simulated game at extended spring training, MLB.com reports.
Kolek is in the process of building back up after suffering a Grade 1 left oblique strain in late February and missing the remainder of the Cactus League. The 28-year-old remains in Arizona but could soon report to an affiliate to begin what will likely be an extended minor-league rehab assignment. Kolek isn't projected to return from the Royals' injured list until late April or early May.
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Royals' Stephen Kolek: Out with strained oblique
Rotowire
The Royals placed Kolek (oblique) on the 15-day injured list Wednesday.
Kolek strained his left oblique in late February. He's been throwing off a mound and appears close to returning to game action, though the righty could be assigned to Triple-A Omaha rather than the major-league club once he's healthy.
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Royals' Stephen Kolek: Progressing in rehab
Rotowire
Kolek (oblique) threw a bullpen Saturday and could pitch in minor-league games next week, MLB.com reports.
Kolek is gradually building back up as he recovers from the Grade 1 left oblique strain he suffered Feb. 25, logging bullpen sessions Wednesday and Saturday. The right-hander is making progress, but it remains likely he opens the season on the injured list before reporting to Triple-A Omaha.
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Royals' Stephen Kolek: Begins mound work
Rotowire
Kolek (oblique) threw a bullpen session Wednesday, Anne Rogers of MLB.com reports.
Wednesday marked Kolek's first time throwing off a mound since he suffered a left oblique strain in late February. With just nine days remaining until the Royals' regular-season opener, it's unlikely that the 28-year-old righty will have enough time before then to build up to a starter's workload. However, he may be able to work as a multi-inning reliever in the meantime.
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Royals' Stephen Kolek: Playing catch
Rotowire
Kolek (oblique) began playing catch from up to 60 feet Monday, Anne Rogers of MLB.com reports.
Kolek was shut down for more than a week after being diagnosed with a Grade 1 left oblique strain. He will be slowly ramped back up before returning to Cactus League action. The right-hander should be healthy for Opening Day, barring setbacks, but the injury has significantly lessened his chances of obtaining a spot in the Royals' rotation.
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Royals' Stephen Kolek: Has Grade 1 oblique strain
Rotowire
Kolek has been diagnosed with a Grade 1 left oblique strain, Anne Rogers of MLB.com reports.
As Rogers reported Thursday, Kolek will be shut down for at least the next week before the next steps in his recovery are mapped out. The right-hander is competing for a spot in Kansas City's rotation this spring.
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Royals' Stephen Kolek: Diagnosed with left oblique strain
Rotowire
Kolek has been diagnosed with a left oblique strain and will be sidelined for at least the next 5-to-7 days, Anne Rogers of MLB.com reports.
As Rogers notes, Kolek could be sidelined even longer if his Thursday scans reveal the injury is more severe. Kolek felt his side grab while warming up in the bullpen during Wednesday's Cactus League bout with the Mariners. Kolek is competing for a spot in Kansas City's rotation this spring after he was acquired from the Padres at the trade deadline last summer.
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Royals' Stephen Kolek: Nursing side injury
Rotowire
Kolek felt tightness in his left side while warming up in the bullpen during Wednesday's Cactus League game against the Mariners, Anne Rogers of MLB.com reports.
Kolek went into the clubhouse to have his left side evaluated by medical staff, and an update on his status should be made within the next couple days. The 28-year-old right-hander was acquired by the Royals from the Padres at the trade deadline in late July and is competing for a spot in Kansas City's rotation. Across five starts with the Royals in 2025, Kolek posted a 1-2 record with a 1.91 ERA, 0.76 WHIP and 21:5 K:BB across 33 innings.
Royals' Stephen Kolek: Adds another quality start to surge
Rotowire
Kolek (5-7) took the loss Wednesday against the Angels, allowing three runs (two earned) on five hits and three walks in six innings. He struck out two.
Kolek submitted his sixth straight quality start and his ninth of the season through 19 outings. Although it may not have been enough to push the Royals into the postseason, the right-hander kicked things into a higher gear since landing in Kansas City, producing a 1.91 ERA, 0.76 WHIP and 21:5 K:BB across 33 innings. Kolek's surge to finish the campaign gives him a strong case for a rotation spot in 2026, and he may have worked his way into the club's long-term plans heading into the offseason.
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