Hilfenhaus has represented Australia in 27 Tests, 25 One-Day Internationals (ODIs) and seven T20 Internationals. He has played for two IPL franchises in past editions.
Kerala wicketkeeper-batsman Vishnu Vinod has replaced injured Lokesh Rahul in the Royal Challengers Bangalore squad.
Rahul was ruled out of the tournament due to a shoulder injury. The 23-year-old Vinod has had good runs in the limited-overs formats in domestic cricket, hitting a total of 16 sixes in T20 competitions.
Earlier, Tamil Nadu batsman Washington Sundar was signed by Rising Pune Supergiant as a replacement for Indian Test all-rounder Ravichandran Ashwin. Sundar represented India at the under-19 level and made his senior debut for Tamil Nadu last season.