Lucas struggled to settle at Anfield when he first arrived in 2007, with his performances on the pitch drawing a lot of criticism.
However, the 25-year-old is now seen as an integral part of the team when fit, and has transformed himself into a fan favourite.
"It was hard for me when I came, I was a young boy and had no idea about the Premier League, the way football was played here, the culture, the city. Everything was a big change for me," said Lucas.
"Many times I thought maybe my life here was finished but I always felt something different that told me to keep going, to keep trying to change the opinions, and I think people started to realise the work I was putting into the games.
"That period made me stronger and made me realise where I was. Every day of my life I try to give my best for this club, because I really know how big this club is and how much people, the supporters, expect. I think I can handle anything that happens now."
Lucas is currently recovering from an injury he picked up against Manchester City earlier this season and is expected to be back next month.