Hales will be available for selection for Mumbai Indians' last league game against Sunrisers Hyderabad on May 17, subject to the completion of contractual paperwork formalities, a statement from the tournament orgainsers said today.
The 26-year-old Hales has represented England in 33 T20 Internationals, with an average of 37.92 and a strike rate of 138.46.
Anderson was ruled out of the T20 tournament with a minor fracture in one of his fingers.