Lucas admits the "struggle" was good for him.
"I don't think many Brazilian players make the move from Brazil to England. Rafael to Manchester United is one but he was young and he had time. Maybe Spain or Portugal is a good place for Brazilian players to adapt," he told liverpoolfc.com.
"But for me, to come here and to try to get into the team competing against Gerrard, Alonso, Mascherano and Sissoko was very hard. I left Brazil in a really good situation and here I was sometimes not even on the bench and out of the squad. It was a difficult period for me but I think it was worth it. Today I realise how important it was for me to have that struggle because it taught me to work hard."