The Premier League leaders were back at their Melwood training ground on Wednesday (20.05.20) as they worked in small groups for the first time since the lockdown due to the coronavirus pandemic.
Speaking to the club's official website, the boss said: "I woke up even earlier than usual and then I realised it was my first day.
"It felt like the first day at school - for me, it was 46 years ago, but it must have been similar.
"I dressed myself in my uniform again - and for the right reason, for going to training."
The government has eased restrictions which allows players back in training in small, staggered sessions, with the English top flight hoping to resume its current campaign in June.
Liverpool need just two more wins to secure their first Premier League title with nine games remaining.
Klopp added: "We don't know exactly how long we have, but we have some time to prepare the rest of this season and already the next season, because I don't think there will be a massive break between the two.
"It's a pre-season for us. We don't know how long and we will not have test games or friendlies.
"Maybe we can organise it between us when we are allowed to, but it will not be the same like in other pre-seasons."