Days after the final, it emerged that Karius had undergone medical examinations that confirmed he had suffered a concussion in a clash with Sergio Ramos.
Klopp is in the market for another attacking midfielder after failing to sign a replacement for Philippe Coutinho following his big-money move to Barcelona in January and he's on the look out for alternatives after a proposed deal to sign Nabil Fekir from Lyon broke down last month.
However, Karius proved he was desperate to remain in Klopp's plans as he appeared in the Reds' opening pre-season friendly against Chester FC on Saturday.
'I said, 'what?' because in the game, from my position that situation is not very good to see: 'maybe there was contact or not'. I told him immediately, OK. He said the doctor is the most famous doctor in Germany.
The shot-stopper was replaced at half-time but only as Klopp was keen to give Danny Ward some minutes ahead of the 2018/19 campaign. How can we think that?
"That was, for me, the explanation".
"To be honest, it's not that I [spend] five hours on the line-up and think, "that will fit together".
"Whoever had a concussion knows there is not one way how it feels, there are different ways".
"If you ask Loris, he says he didn't think about it and didn't use it for a second as an excuse".
"We don't use it as an excuse, we use it as an explanation", Klopp told the official Liverpool website. That's always important, that's what analysis should be: you explain why things happen.
There are question marks about the Belgian from a fan point of view - before he was farmed out on loan to Wolfsburg, Origi demonstrated that he could be frustrating in the final third, sometimes lacking consistency over his end product. You make a mistake against Chester and it's a mistake.
'He was influenced by that knock, that is 100 per cent. I am sure the other two or three targets they are after will help them be stronger and make the squad stronger and hopefully they can have a right good go at it. It's really not important what the people say. That was, for me, the explanation and I thought: "OK, come on, we need to check that".