Orioles Place Chris Bassitt on IL, Recall Trey Gibson to Start vs. Mariners

The Orioles placed starting pitcher Chris Bassitt on the 15-day injured list Monday, retroactive to June 5, with low back discomfort. Bassitt, a veteran right-hander signed to a one-year, $18.5 million deal this offseason, is sidelined as Baltimore works to manage another rotation setback early in the season. The team recalled right-hander Trey Gibson from Triple-A Norfolk in his place, and Gibson is slated to start Monday night against the Seattle Mariners at Camden Yards.

The injury report from framed the move as a direct follow-up to Bassitt’s most recent start. In that outing against the Boston Red Sox, he navigated the first two innings efficiently on 20 pitches, but then labored through the third and exited early with a back injury, turning the ball over to Albert Suárez in an 8-1 loss. For the Orioles in 2026, Bassitt has posted a 5.27 ERA across 12 outings, including 10 starts, giving the club a sense of what it is losing operationally: a steady, innings-oriented arm that could be relied on in the back half of a rotation.

Bassitt’s absence also raises questions about how Baltimore will cover the gap around the rest of its starter group. When a pitcher lands on the 15-day IL retroactive to a prior date, the practical impact is still straightforward for the next few turns: the Orioles must keep the rotation filled while preserving bullpen usage and managing workloads for the pitchers already on the staff. Over the long run, teams can absorb one off-day type of disruption, but repeated pitching issues can tighten decision-making around reliever roles and bullpen availability.

Gibson’s promotion offers a defined solution for one start. previously highlighted him as the Orioles’ No. 3 prospect per MLB Pipeline, and he has been developing in Norfolk as a potential rotation contributor rather than a pure depth option. With Bassitt unavailable, the Orioles are using that path as designed: recalling a starter-caliber arm to meet immediate schedule needs while also giving Gibson exposure to major-league hitters in a real-game setting.

This game against the Mariners is likely to define the next stretch in more than one way. For Baltimore, it is a chance to stabilize the rhythm of its rotation at a time when the club cannot afford wasted starts. For Gibson, it is an opportunity to establish whether he can handle the routine demands of starting pitching at the highest level: turning over quickly after a second or third time through the order, limiting damage when command is uneven, and competing for multiple outs with pitch variety rather than relying on one dominant look.

The Orioles did not announce how soon Bassitt might return beyond the minimum window implied by the injured list designation. That uncertainty is the real headline, because a low back issue can be slow to respond even when it is described as discomfort. What to watch next is how the club manages the rotation during the coming turns, and whether Gibson’s first outing indicates the kind of durability Baltimore can count on while Bassitt recovers. If the Orioles get quality innings from the recall, the rest of the staff can be protected more effectively, and the organization buys time for the longer-term rotation picture to settle.