Klopp was speaking after defeat to Borussia Dortmund in Indiana.
He said, "The MLS is growing – it's growing and growing and growing.
"There is no problem in America, you see women's football pretty much dominates the world of football, men's football is coming up and the only little thing is because of the capacity we play in a football stadium or baseball stadium. So if at one point – and I think it will happen the more the MLS grows – you have 50/60/70,000-people stadiums, pure European football stadiums, that would change the game completely. I am not sure how many teams play here on astroturf, for example, but that's not how international football is and it all helps.
"Tonight [Giovanni] Reyna played, Christian Pulisic… Dortmund are very positive about Reyna and Christian Pulisic everybody knows. So, the talents are coming and the understanding for the game will grow, but it is no criticism.
"If you ask me about the rules of baseball I still struggle. We have a different history – our football, soccer, history is longer and yours in other sports is longer, so it's no criticism from our side. I think each game we can play and use as a kind of commercial for this wonderful game, we should play. We just have to make sure in the future we can do it on a little bit better surface."