The Astros reinstated Imai (arm) from the 15-day injured list to start Tuesday's game against the Mariners, Julia Morales of Space City Home Network reports.
Imai is ready to rejoin Houston's starting rotation after spending a month on the IL due to right arm fatigue. The 28-year-old built up to just 63 pitches across three innings during his second of two rehab outings, so the Astros plan to limit his workload to around 80-to-85 pitches Tuesday, per Chandler Rome of The Athletic.