Brendan Donovan starts Mariners rehab assignment at Arizona Complex League

Seattle’s Brendan Donovan has begun the next phase of his return from the injured list, starting a rehab assignment on Wednesday with the Mariners’ Arizona Complex League affiliate.

According to the club’s official update, Donovan is participating in the Arizona Complex League as part of a controlled progression back to game action. He entered the first day of the assignment as the designated hitter, a role that typically allows hitters to ramp up their at-bats and timing while the organization monitors workload and readiness.

Donovan has been sidelined for nearly two months, and the Mariners’ release attributes the stint on the injured list to an injury described as left in nature. The move to rehabilitation does not guarantee a specific return date, but it indicates that the team considers him far enough along in the recovery process to handle live at-bats and day-to-day baseball routines.

The Arizona Complex League functions as a developmental environment for organizations across professional baseball, and rehab assignments there are commonly used when clubs want to keep a player close to their minor-league operations while he builds stamina and baseball-specific rhythm. For a hitter like Donovan, the early stages of rehab often focus on consistency, follow-through, and the ability to repeat an effort in consecutive games.

Beyond the logistics, Donovan’s situation carries roster and tactical weight for Seattle. When a player is nearing a return from the injured list, the immediate question becomes how his health changes the team’s internal balance, including who is available for starts, how the infield is managed, and what lineup options the club can use as games stack up.

The Mariners’ release frames this assignment as the start of Donovan’s comeback trail again, underscoring that his priority now is baseball activity rather than long-term timetable speculation. Rehab assignments are frequently adjusted based on how a player responds to each outing, which can influence whether the stint remains on a steady track or is slowed to ensure full readiness.

As Donovan works through the next set of rehab appearances, the key storyline will be whether the organization keeps him on the designated hitter path in the early games and how quickly he progresses from one day of action to the next without setbacks. For Mariners fans, the first indicators are simple ones: the ability to take regular reps, produce in at-bats, and finish sessions without additional complications.

The Mariners will likely treat the rehab window as a series of checkpoints rather than a single finish line. If Donovan continues to respond well, this Arizona stop becomes a bridge toward rejoining Seattle’s active roster, with the timing shaped by both his recovery and the team’s evolving needs.