The Reds are believed to have recently rejected a £119m offer from the La Liga giants for Coutinho, who is yet to feature this season amid uncertainty over his future at Anfield.
Barca are seeking a replacement for fellow Brazilian attacker Neymar following his world-record €222million transfer to Paris Saint-Germain earlier this month.
"To be disappointed about different things, you need to have expectations," Klopp said. "I don't have expectations, I don't think about other clubs to be honest.
"We all have our own problems. If we think we have to do something, we do it. In this moment I would have preferred we finished our business six weeks ago. Let all the rest of the world do what they do. It's getting more and more different and difficult.
"I don't judge what other clubs are doing. I am not sure there was one easy day since we started pre-season. Always something changes.
"All the discussions about Phil and then in the same moment Adam Lallana gets injured. It was like 'what?' I don't think anyone can expect that we are prepared for this. The team have handled it all brilliantly so far."
Klopp's men host Arsenal in the Premier League on Sunday fresh off qualifying for the UEFA Champions League on Wednesday.