Bumrah, the 2024 international cricketer of the year, has been out action since he missed the final day of the fifth Test against Australia in Sydney in January because of a back injury.
Five-time champions Mumbai announced Bumrah's return with a video on social media titled "ready to roar".
Bumrah, 31, will be key to Mumbai's hopes of a turnaround after losing three of their four matches this season.
They face Bengaluru at their home Wankhede Stadium on Monday.
Chennai Super Kings all-rounder R Ashwin has sought clarity from the franchise on how they intend to use him in IPL 2026, and has told them he is open to parting ways if he is not part of their plans, according to ESPNcricinfo.
Former Chennai Super Kings (CSK) captain MS Dhoni recently opened up about the franchise’s underwhelming performance in the 2025 IPL season. While acknowledging that things didn’t go as planned, Dhoni expressed optimism for the future.