Emotions were high after his last game on the Anfield bench last May, and in addition to the tears that flowed then, there was concern and uncertainty among Liverpool fans about what awaits them in the coming season under the leadership of new coach Arne Slot.
However, they had no reason to worry. Slott led Liverpool to their 20th league title.
Although the Dutchman was a key strategist in Liverpool's campaign this year, his success, as he himself pointed out after his team officially became champions on Sunday, owes a large part to the team and culture built by Klopp.
Liverpool only brought in one player this season, Federico Chiesa, and although he only played a supporting role, the club managed to equal the number of titles with their biggest rival, Manchester United.
BBC Sport, through a documentary on BBC iPlayer about Liverpool's path to winning the Champions League in the 2018/2019 season, shows how Klopp arrived at Liverpool and how he created the foundations on which Slot could later build.
Why did Liverpool choose Klopp over Ancelotti?
When Liverpool were looking for a manager to replace Brendan Rodgers, the "two main candidates" according to the club's former director of scouting, Ian Graham, were Jurgen Klopp and Carlo Ancelotti, who were both out of work at the time.
Ancelotti was a "great coach", but Liverpool at the time did not have the "kind of team" with "proven superstars" that the Italian was used to leading.
On the other hand, Klopp had previously led a young Borussia Dortmund team to the Bundesliga title in 2011 and 2012 and was seen as a much better choice for the situation at the time.
"Our strategy was to bring in young players, develop them and bring them to the top together, so that one or two years later we could achieve success," Graham said.
Klopp was appointed Liverpool manager in October 2015, when the club was tenth in the Premier League table, and he immediately began to introduce his philosophy and principles at Anfield, from which Slott later benefited.
"We always wanted to create stories that we could tell our grandchildren," said Peter Kravitz, who worked with Klopp at Mainz and Dortmund, and then joined him at Liverpool as an assistant coach.
"There is only one way, do it as a team. Do it with your friends. Use it to feel together as friends, as brothers, as family. Know how much you need the support of everyone around you: analysts, doctors, physiotherapists, nutritionists. We can only succeed together. As long as you are alone or leave others alone, you have no chance. Keep believing, follow your dream, don't give up. And then one day the reward will come. Our goal has always been to do our best, without expecting any guarantee of success."
"From those who doubt to those who believe"
Success in the form of trophies has long been elusive.
Liverpool won an impressive 2018 points in the 2019/97 season, although in most other seasons that would have been enough for the title, they lost the race for first place to Manchester City by just one point.
They also lost in the 2016 League Cup and Europa League finals, as well as the 2018 Champions League final.
However, all the work Klopp put into his team was finally rewarded when he won his first trophy with Liverpool, a 2-0 victory over Tottenham in the 2019 Champions League final.
The path to that trophy weaved Klopp's signature combination of tactics, emotion and exciting football, a style that Arne Slott perfected, rather than completely changed.
"The idea was to press the opponent and not let them get into the game," Kravic said. "They do what we let them do on the field, we dominate even without the ball, and then, when we win it, the first instinct is to take it high up the field and attack the goal immediately."
"We had to adapt with the times. We were constantly learning, but without changing the basic idea until the end."
He added: "We, as a coaching staff, believed in our way of working. We had to convince both the players and then the people around us to turn doubters into believers."
Kravic admitted that Klopp's play could sometimes seem "wild", but that "it was part of the plan", and the best evidence of this was the 2019 Champions League semi-final against Lionel Messi's Barcelona.
Liverpool looked completely lost after a 3-0 defeat in the first leg at Camp Nou, before orchestrating one of the most memorable comebacks in Champions League history.
"Right after the first game, there was a very defining moment in the dressing room, because Jurgen stood up and said: 'Hey, gentlemen, this game is not over. We have a second half. Yes, we are losing 3-0, but we are Liverpool and we are playing at home next Sunday,'" Kravic said.
"For us, football is always about playing football with the heart. The whole strategy, all the tactics, all the instructions you give them, but also allowing the team to feel the game, the energy of the stadium, the mutual support, as well as the involvement of the fans in the game on the home field, which is possible at Anfield, we knew that and that's what we were trying to develop."
"Klopp set everyone on fire for the match"
Liverpool's data analysis department estimated they had just a 3,5% chance of pulling off a comeback against Barcelona before the second leg, but, as the injured Mohamed Salah's shirt read before the match, Liverpool under Klopp "never give up".
Divock Origi quickly reduced the deficit to 3-1 for Liverpool, and two goals from Georginio Wijnaldum, who was "crazy with anger" at not starting the game, levelled the score at 3-3, before "that" corner situation followed.
While Barcelona were still in the process of setting up for a Liverpool corner, Trent Alexander-Arnold, pretending to walk away from the ball, suddenly turned and sent a low ball that Origi placed into the net, sparking an eruption of madness as Liverpool won 4-0.
"I didn't know it at the time, but our analysts were paying a lot of attention to the execution of the break," Graham said.
"They noticed that it was a recurring theme that when Barcelona receive a corner, they are more concerned about the arguments between themselves than the defense itself. Divock and Trent were prepared for this."
"Credit goes to the video analysts, Trent and Divok for spotting the opportunity and taking advantage of it."
Liverpool then defeated Tottenham to win the Champions League for the sixth time.
"It's not difficult to play for Jurgen. He's a motivator. He makes you run through the wall for him. The good thing is he'll do the same for you," said Liverpool left-back Andy Robertson.
"I think he was probably a very kind man. He was always walking around the field and giving hugs."
"He wanted everyone to feel like they were a part of it in that moment. Going to training was the right place to be. You could see that everyone was extremely motivated."
Klopp may no longer be on the bench, but his players have proven this season that the atmosphere he created at Liverpool still exists, along with the "all for one, one for all" attitude that has been instilled in their players.
Liverpool goalkeeper Alisson added: "Jurgen was always precise in the words he used before games. He has this natural talent to ignite everyone for the game."
Bonus video:
