The figures came from Swiss academic research group CIES Football Observatory, which revealed that Liverpool took in more money from transfers than any other European club.
Last summer, the club spent around £63m on six new arrivals, but 13 players were shown the exit door at Anfield.
"What was the number for Sterling? £80m? Only £49m!" the Liverpool Echo quotes Klopp as saying. "It shows a lot if you want - a club changing and not as successful as everyone wants so you need to make changes and everyone feels under pressure.
"Our transfer window was quite busy and I don't want it to be that busy in future. If you are really convinced [about a player] then development doesn't stop after a year. You have more time and success. It's about having consistency.
"The successful teams don't have to change a lot. There is no need for Liverpool to be a selling club. Nobody calls and says: 'come on, sell, we need money'. It's about finding the right squad. I'm not that busy usually in transfer windows but it was the situation. The squad was quite big and we needed to do a few things."
Meanwhile, Liverpool are preparing for Saturday's Premier League match against Hull City at Anfield.