The Spain international featured regularly during Klopp's first season in charge at Anfield but found himself out of favour during the 2016-17 campaign, starting just two Premier League matches as midfielder James Milner was preferred at left-back.
The arrival of Scotland international Andy Robertson during the summer had been expected to limit Moreno's first-team opportunities further this term, but he has instead featured on a regular basis.
The 25-year-old has now revealed that his relationship with Klopp has been odd due to his periods in and out of the team, but insists he is currently enjoying a close bond with the German.
“It has been strange,” Moreno told Marca. “He arrived and I played every game, then at the start of the next season I disappeared. When I saw James Milner, a right footed midfielder, at left-back I knew something was happening. He did not give me any explanations.
“It is a totally different relationship. He even speaks to me in Spanish sometimes. He’s helping me a lot and I think it shows. I’m a more mature player with better defensive awareness.”