Duckett admitted that ODIs will be a different ballgame due to major structural changes in the Indian side.
The ICC is evaluating radical structural changes to maintain relevance of ODI format.
Varun suffered a hamstring injury during the England T20Is.
The Zimbabwe v India T20I series will be played in Harare from July 23-26.
India and England will clash in the first ODI in Birmingham on July 14.
India women defeated England by 270 runs in the first-ever Women's Test match at Lord's.