The Brazilian midfielder is enjoying a resurgence under the German manager.
The German replaced Brendan Rodgers at Anfield earlier in the season, and has overseen a dramatic turnaround of fortunes at the club.
The last few weeks have been some of the best of his reign, with a 4-1 win at Manchester City being followed by a 1-0 victory over Swansea, before a 6-1 demolition of Southampton in the Capital One Cup in midweek.
While the Reds are playing better football, it is confidence that has been dramatically improved, with each player in the squad seemingly playing to their utmost now.
And Lucas says personally, confidence is one area where Klopp has come in and changed things for him.
"I’m learning a lot and he’s a very demanding manager but a person who tells you what you need to do to improve," he told liverpoolfc.com.
"That’s what he wants and if you make mistakes he just doesn’t kill your confidence and he gives you confidence to improve and tells you what you need to do.”
"For me it was about the belief and the confidence that I needed. I think he’s been giving me that and giving me an important role to play in the team.”
With confidence now soaring at Anfield, they are very much eyeing up a place in Europe next season.
At present they are sixth in the table with 23 points to their name after fourteen games of the season. That tally leaves them just two points short of Tottenham in fifth, and a mere four points away from Arsenal in fourth.