While the Premier League window closed on August 8, the European window this year remains open until September 2.
And Klopp believes while the intention was sound, the practicalities make the situation difficult for English clubs.
“I don't care when it closes, but it must close at the same time," said the Reds boss of the window.
“That was the idea in the first place. They spoke about finishing it before the season starts, good idea, but only England did it. That makes no sense.
“Can somebody explain what is the benefit for the Premier League? We don't really have a problem but for other teams, their key players are still on the market and everything can happen.
“You want a team together and focused on the future, but that cannot happen when there is a door open. I don't understand why this decision is not already reviewed at least. It was a good idea but it didn't work out."