The Cubs’ bullpen picture is about to get crowded, and that’s where the real stress test begins.
Jacob Webb has been the steady hand in a relief corps that has spent much of the 2026 season either patched together by injuries or short on reliable late-inning arms. What looked like a temporary fix back in April has turned into one of the better bullpen stories in MLB. But with reinforcements expected back soon, the Cubs are going to have to clear space, and that means some familiar names are suddenly staring at a tough path.
Right now, the bullpen consists of Aaron Civale, Braxton Garrett, Trent Thornton, Ryan Rolison, Caleb Thielbar, Ryan Zeferjahn and Webb. That group is already in motion because Kevin Gausman and Clay Holmes have joined the rotation, which has pushed Javier Assad and Colin Rea onto the fringes after the trade-deadline additions.
Assad is the easier case to explain. He still has minor league options, so he can be sent back to Triple-A whenever the Cubs need to activate someone from the injured list.
Garrett is in a similar lane. The left-hander was traded by the Miami Marlins to the Cubs on Monday for a pair of prospects, and after starting at Triple-A, he was added to the big-league bullpen earlier this week in Tyler Ferguson’s place.
If Assad does get optioned to Iowa, it would not be because he’s been ineffective. He owns a 3.58 ERA in 75.1 innings this season, and moving him would be more about roster flexibility than performance. It would also keep him stretched out in case the Cubs need him for a spot start later.
The names that feel less secure are Thornton and Thielbar. Ryan Rolison, Ryan Zeferjahn and Webb are viewed as safe, which leaves Thornton and Thielbar as the relievers most likely to be squeezed when the roster shifts again.
Both of them, though, helped the Cubs survive Thursday’s 3-2 win over the Toronto Blue Jays. Thornton and Thielbar each worked a scoreless inning to keep the game tied before Pete Crow-Armstrong ended it in the 11th, scoring on a throwing error.
Thornton’s overall line still looks respectable. He has a 2.78 ERA and a 48.1% ground ball rate, and he has been trusted in a lot of high-leverage spots this season.
But the recent trend is not as clean. Over his last 5.2 innings, he has posted a 4.76 ERA with a 1.76 WHIP across seven games.
The deeper numbers add to the concern. Thornton has a 12.2 K% and a 10.1% walk rate, which is not the kind of mix that tends to hold up. His .212 BABIP suggests the bottom may be ready to fall out a bit, and the hard-hit contact backs that up: since he made his season debut with the Cubs on May 5, he has allowed the fifth-highest hard-hit% among all relief pitchers with at least 30 innings.
Thielbar’s issue is different, but just as glaring. The veteran lefty was excellent last season, putting up a 2.64 ERA, 0.88 WHIP and a 25.5 K%, while allowing only five home runs in 58 innings. This year, the strikeouts are still there at 28.7%, but the walk rate has climbed to 8.7%, and he has already given up 10 home runs in just 35.1 innings.
That home run problem has become even more pronounced lately. Since July 8, Thielbar has allowed five homers in 10.1 innings. The Cubs are leaning on him in important spots because they have to, but that’s not a trend they want hanging around late in games.
Hoby Milner, Daniel Palencia and Edward Cabrera are all expected back sometime in August, which only tightens the squeeze. Assad and Garrett are the simplest moves because of their option flexibility, but if the Cubs need another opening beyond that, Thornton and Thielbar are the names that may be fighting to stay put until the next round of roster decisions in September.
Even with the home run trouble, Thielbar may still have a path to remain because of what he brings from the left side. That strikeout ability still matters, and in a bullpen like this one, it can buy a reliever a little more time.
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