New Delhi, Feb 21 (IANS) Indian all-rounder Hardik Pandya has been ruled out of the upcoming Twenty20 International and One-Day International series against Australia due to lower back stiffness, BCCI announced on Thursday.Left-arm spin-bowling all-rounder Ravindra Jadeja has been named replacement for Hardik for the ODIs. However, no replacement has been named in the T20I squad.The BCCI medical team decided to rest the all-rounder and let him undergo strength and conditioning work for his lower back at the National Cricket Academy (NCA) in Bengaluru, BCCI said in a statement. --IANS gau/mr