The Brazilian matured into a key figure at Anfield following the departures of Xabi Alonso and Javier Mascherano, but saw his campaign cut short last season by an anterior cruciate ligament injury picked up in December 2011.
His return was further hampered by a torn thigh muscle in August - but since returning to the side in December he has been ever-present, and now he believes the stellar performances of old are returning.
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"After Pepe [Reina] and Daniel [Agger], I have been the longest here. [Jamie] Carragher and Stevie [Gerrard], of course, are out on their own but each season you are here, your responsibility grows.
"I am not a kid anymore. I have responsibilities and to be a role model for these kids is something that makes me really proud.
"It has been an amazing experience. All the work I have put in behind the scenes is beginning to show through."
Lucas endured a rough ride from Liverpool fans at the start of his career in England, and freely admits it took him considerable time and effort to adapt to life far from home.
"It was very hard," he added. "At first I couldn’t speak the language, I didn’t have many friends and family was not here.
"It was a struggle to get to know people and I found it difficult getting involved in the day-to-day things that went on at the club.
"Yes, the food was different and the city was new but I lead a quiet life and those aspects were not too much of a problem. I just felt that if I could handle it all, I’d get there.
"I needed to be mentally strong otherwise it would have been tough."