Harper joins the squad following an impressive outing for Australia A against India A in Puducherry, where he scored 128.
Maddinson’s inclusion marks a potential return to Test cricket after a decade, having last represented Australia in the format in 2016. He has also returned to cricket following his battle with testicular cancer.
Meanwhile, all-rounder Cameron Green’s availability for the first Test remains uncertain after he sustained a lower abdominal strain while batting in the final ODI against South Africa. His fitness will be assessed over the coming week.