The Nationals recalled Perales from Triple-A Rochester on Wednesday.
Perales will get his first taste of the big leagues after he submitted a 3.64 ERA, 1.30 WHIP and 97:55 K:BB while holding opposing hitters to a .199 average across 96.1 innings in his 25 appearances (19 starts) with Rochester. The 23-year-old righty made his final three appearances at Triple-A as a reliever and will work out of the bullpen to begin his time with Washington. He could be called upon to cover multiple frames in relief Wednesday against the Rockies, as starter Matt Waldron isn't fully stretched out and could be operating as a glorified opener.
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Nationals' Luis Perales: Set for promotion
Rotowire
The Nationals are expected to recall Perales from Triple-A Rochester on Wednesday, Kyle Williams of TheBanner.com reports.
The 23-year-old righty will get his first big-league opportunity after posting a 3.64 ERA and 1.30 WHIP over 96.1 innings at Triple-A. Perales has worked primarily as a starter this season but will likely begin his MLB career in the bullpen after pitching two innings or fewer in each of his last four minor-league outings.
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Nationals' Luis Perales: Could make MLB debut soon
Rotowire
Perales is a pitcher the Nationals believe is nearly ready to make his big-league debut, Spencer Nusbaum of The Athletic reports.
Acquired from Boston in the offseason, Perales had a bumpy start to the season after completing his recovery from Tommy John surgery, but over his last eight starts for Triple-A Rochester he's put together a 2.79 ERA, 1.29 WHIP and 41:25 K:BB in 38.2 innings. The 23-year-old right-hander is still working to improve his control and his stamina, but Perales has elite raw stuff headlined by a four-seamer that averaged 98.5 mph and a split-finger pitch that's generated a 42.2 percent whiff rate in 2026. A late-season stint with the Nationals would put Perales on track to win a spot in the rotation next spring.
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Nationals' Luis Perales: Heading out of big-league camp
Rotowire
The Nationals optioned Perales to Triple-A Rochester on Sunday.
Perales is still waiting to make his MLB debut, but his presence on the Nationals' 40-man roster boosts his chances of contributing to the big club at some point in 2026. The 22-year-old right-hander was limited to just three appearances in the minors last season as he completed his recovery from July 2024 Tommy John surgery. The Nationals will likely keep him stretched out as a starter at Rochester, but if he receives a call-up to the majors in 2026, he could work out of the bullpen in order to manage his workload.
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Nationals' Luis Perales: Dealt to Nationals
Rotowire
The Nationals acquired Perales from the Red Sox on Monday in exchange for Jake Bennett, Jeff Passan of ESPN.com reports.
It's a prospect-for-prospect trade. Perales missed a large chunk of 2024 and nearly all of 2025 while recovering from Tommy John surgery, but he's wowed with his stuff since returning, regularly reaching triple digits with his fastball. The 22-year-old has thrown a total of 9.2 innings beyond A-ball and has a career 12.3 percent walk rate in the minors, but Perales' upside is huge.
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Red Sox's Luis Perales: Sent to minor-league camp
Rotowire
The Red Sox optioned Perales (elbow) to minor-league camp Friday, Mac Cerullo of the Boston Herald reports.
Perales is still working his way back from last June's Tommy John surgery. The 21-year-old has begun a throwing program but is not expected to pitch in minor-league games until 2026.
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Red Sox's Luis Perales: Tommy John surgery completed
Rotowire
Perales (elbow) underwent a full UCL reconstruction surgery last week, Chris Cotillo of MassLive.com reports.
As anticipated, Perales required a traditional Tommy John surgery to repair the damage ligament in his right elbow rather than an internal brace procedure. As a result, Perales is unlikely to be ready to pitch late in the 2025 season, whereas an internal brace procedure would have resulted in a shorter timeline that could have put him in line to pitch at some point after the All-Star break in 2025. The 21-year-old -- who is regarded as one of the Red Sox's top pitching prospects -- should be back to full health in advance of spring training in 2026.
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Red Sox's Luis Perales: Dealing with elbow inflammation
Rotowire
Double-A Portland placed Perales on its 7-day injured list Sunday with right elbow inflammation, Alex Speier of The Boston Globe reports.
The 21-year-old suffered the injury during his start Saturday, and the initial diagnosis of inflammation is an encouraging development. Perales has yet to undergo an MRI, and it remains to be seen if that will be necessary.
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Red Sox's Luis Perales: Exits start with injury
Rotowire
Perales was removed from Saturday's start at Double-A Portland with an injury to his throwing arm, Geoff Pontes of Baseball America reports.
Perales stepped off the mound after throwing a pitch and was hanging his throwing arm. He was visited by a trainer for a brief moment before exiting to the dugout. Saturday's outing was just Perales' second at Double-A and he tossed five scoreless innings with seven punchouts in his Portland debut. An update on his status should come later this week.
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Red Sox's Luis Perales: Optioned to Triple-A
Rotowire
The Red Sox optioned Perales to Triple-A Worcester on Friday.
The 20-year-old was added to Boston's 40-man roster in November in order to protect him from being selected in the Rule 5 Draft, but he was never a realistic candidate to make the Opening Day roster. Perales split last season between the Single-A and High-A levels, posting a 3.91 ERA, 1.42 WHIP and 115:50 K:BB across 89.2 innings.
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Red Sox's Luis Perales: Put on 40-man roster
Rotowire
The Red Sox selected Perales to their 40-man roster Tuesday, Chris Cotillo of The Springfield Republican reports.
Perales is only 20 years old and still pretty far away from reaching the majors, but Boston has opted to protect him from being plucked away in next month's Rule 5 Draft. The young right-hander posted a 3.91 ERA and 115:50 K:BB over 89.2 innings (21 starts) this past season between Low-A Salem and High-A Greenville.
