The Brazilian's previous deal was due to expire in 2015, and he says it was an "easy decision" to extend his stay at Anfield, for whom he has already made over 200 appearances
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His previous deal was due to expire in 2015, but the new contract will extend his stay on Merseyside and Lucas is delighted to have put pen to paper.
"It's another long-term contract that I have signed - but it was the same feeling as when I first came here," he told the club’s official website.
"I am really delighted to have the opportunity to play for this club. It's where I think I belong and where I wanted to stay, so I am very happy and looking forward to a few more years here.
"It was an easy decision because after the long period of my career I have had here, I would like to give the best of my time to this club.
"It was not a difficult decision to make and I am really looking forward to what will hopefully be a few more years with a lot of success."