The Chicago Cubs entered the 2026 season with significant depth in the area of starting pitching. While analysts weren’t blown away with the high-end potential of the rotation as a whole, most everyone agreed that the team’s strength was in its depth.

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Chicago started the regular season with five established starters (Matthew Boyd, Cade Horton, Shota Imanaga, Edward Cabrera, and Jameson Taillon) on the Opening Day roster, along with two rotation-capable swingmen (Colin Rea and Ben Brown). Reliable swingman Javier Assad was assigned to start the season in Triple-A Iowa, but would only be a phone call away from Wrigley. Jordan Wicks was also a name tossed about as a possible rotation fill-in. Meanwhile, ace Justin Steele is slated to make his return in May-June.

All told, that makes ten potential starters in the mix for a season where big things are expected.

Now, there’s talk that, maybe, the Cubs won’t have the rotation horses after all.

Horton’s injury spotlights Cubs rotation weak points

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Cade Horton’s forearm injury on Friday and subsequent placement on the 15-day IL is the biggest cause for alarm right now, of course. The 24-year-old right-hander was expected to be an ace-level presence on the mound after a second-half of 2025 that saw him emerge as an elite starter.

But Horton has been injury prone throughout his young career. Last year, he was shut down with a fractured rib late in the regular season and would miss the playoffs entirely. In 2024, he was shut down around mid-season with a shoulder injury. He already has a Tommy John surgery in his past.

At best, Horton had to be seen as a question mark when it came to full season duty.

New Cub Edward Cabrera also has a history of injury, with two stints on the IL just last year.

Matthew Boyd, regarded as injury-prone as well, pitched a full season last year, but it was his first 100+ inning campaign since 2019.

Shota Imanaga got smacked around a bit over the second half of last season and also got smacked around in his first start of this season.

Jameson Taillon got crushed during Cactus League play and looked touchable in his first official start of 2026.

Big problems ahead?

If one of the Cubs’ top starters falters and/or is forced to the IL for a long stretch of time, things will get rough. If a couple starters fall out, there’ll be huge problems. Because, yes, the Cubs have depth, but they’ll need more than seat-fillers. Rea, Brown, and Assad are solid, but there’s a reason they weren’t regarded as rotation fixtures.

For now, as Horton is assessed, the 35-year-old Rea will likely fill the young arm’s spot. The veteran was solid last season as the designated rotation-filler, with a 10-7 record in 27 starts and a 4.33 ERA (11-7, 3.95 ERA overall).

Chicago could do a lot worse when it comes to temporary replacements. But Rea doesn’t bring what Horton brings and “good enough for now” is not what an aspiring championship team needs near the top of their rotation.

For now, it’s reasonable to be alarmed about the team’s starting pitching, especially considering that the season is just beginning and a lot more could happen.

The post Chicago Cubs: Is it already time to sound the starting pitching alarm? appeared first on ChiCitySports.