Upon his arrival at Liverpool, was somewhat taken aback by the state of the locker rooms.

departure in October 2015 and went on to usher in an era of triumph, .

Under his guidance, not only did the team transform, but Anfield itself underwent significant upgrades with expansions to the Main Stand and Anfield Road end, boosting its capacity from under 45,000 to over 61,000 by his last season.

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In the revealing Amazon Prime Video four-part documentary series 'Doubters To Believers Liverpool FC: Klopp's Era,' Klopp reminisces about how he cut a holiday short after leaving Borussia Dortmund in 2015 to take charge on Merseyside.

Recalling a 2014 pre-season friendly with Dortmund at Anfield, he admits that despite anticipating the intense focus associated with managing Liverpool, he was unprepared for the surprises that awaited him at his new home.

"There's all these crazy things, like people track the plane and stuff like that, and you don't have this idea of yourself or that people could be interested in a football manager flying into a country," reflects Klopp in the documentary.

"In the same moment I was really disappointed because I realized 'Oh my god, I forgot that the dressing rooms are really bad!' And I don't like bad dressing rooms."

His promise to shift supporters from 'doubters to believers' became famous during his initial press briefing, along with his vow of bringing a title to Anfield within four years.

Reflecting on Klopp's start at Liverpool, Jamie Carragher noted in the documentary: "Liverpool had been in the doldrums for a few years, and Jurgen in his first press conference declared that they were going to win a title in four years, but I'm not sure everyone believed him!"