Klopp was allowed home that night and was well enough to oversee training at Melwood on Thursday.
"I feel really good. Okay, I'm 50 now - maybe I need to get used to it," joked the German.
"That's the second time I've been in a British hospital. Whatever people say about it, the NHS, it's not as bad as you think!
"I have to thank a lot of people, not because it was that serious, but because they were so nice. There's no more to say about that - I'm not ill."