"I felt in New Zealand my biggest concern was flying on the Monday, arriving on the Wednesday, and then playing that Saturday," said Gatland, the current Wales coach. "By doing that we were opening up players to the potential of injury risk.
"My view is that by taking the field as early as we did in New Zealand without adequate preparation, we were doing that. I'm not the only who has said that, everyone has."
Gatland's latest comments come after Premiership Rugby chief Mark McCafferty's said that shortening the English top-flight season to give more time for the Lions would be "suicide" for the domestic competition.
(Reporting by Aditi Prakash in Bengaluru; Editing by Peter Rutherford)