Alisson was part of the team that clinched the club's first league title in 30 years.
The shot stopper, who admits it was an exhausting season, believes Klopp is the primary reason for the club winning the ultimate prize in domestic football.
He told ESPN Brasil's Bola da Vez program: "This was one of the most exhausting seasons I've ever had. I don't know if it was due to the pandemic, the longer season... It was also one of the seasons I played less games because of injuries.
"We got out of the Champions League early, but I think this exhaustion comes from just giving everything we have every time. Klopp has a great portion of that, just telling us what the main objective is.
"We also care about how we are going to get to that objective -- training, just how he manages our training sessions. He trusts us to do what he wants us to do, on not only training sessions, but also a day-to-day basis.
"He is a passionate guy and he shows that. He wants to win and make Liverpool an even greater club."