Dejan Lovren has praised the 'big changes' that have helped Liverpool to secure silverware.
The Reds are the reigning European champions having beaten Tottenham in Madrid last June and are just two victories away from winning their first league title in 30 years.
They also secured the FIFA Club World Cup and European Super Cup before the end of 2019.
Lovren arrived at Anfield in 2014 before a season that saw the Reds drop out of the Champions League places. The arrival of Jurgen Klopp in October 2015 saw Liverpool challenge for major honours once again, though, before the club lifted their first piece of silverware last year.
Lovren said: "When I came, the club was always big - it was always Liverpool Football Club - but we didn't play well.
"People saw us winning against Manchester United and Manchester City, but then in the next game we would just fail. It wasn't acceptable. When you are a big club, everyone expects you to play well in the small games too."
"He (Klopp) came in and said, 'Guys, I want you to think positively, to believe in yourselves. Without belief, we can't do anything.'
"When I look at the organisation of the club, wow, it has changed unbelievably.
"I can only say well done to the manager, well done to the owners and well done to all the people who are working at Liverpool Football Club."
Liverpool's win over Tottenham to secure the club's sixth European Cup came just over a year after the Reds lost 3-1 to Real Madrid in the Champions League final in Kiev.
Lovren admits he was heartbroken after the defeat but says his manager found just the right words to help the Reds go one better in 2019.
"It's something I always dreamt of and I can also say that for the lads and for the manager," he told Sky Sports.
"The first time we reached the final, when we lost against Real Madrid, he told me, 'Don't cry. Imagine how I feel after losing six finals!'
"He always said we would get another chance and we did."
The defender added: "Winning, for me, is like a drug. When we won the Champions League, I didn't play but I felt so happy and proud to be part of the team.
"But in some moments, of course, you also think to yourself that you want to play. It's not the greatest moment when you don't, but I have a mentality that is focused.
"I'm always ready. If someone is injured and coming off, I'm ready to step in and show my quality. I think I proved that last season, when Joe Gomez or Joel Matip were injured and I came in and played."