The 26-year old Brazilian midfielder has committed himself to the Anfield outfit after coming back twice from serious injuries and Ayre was delighted to see him remain as part of the Reds core.
"It's fantastic. He has been such a great servant to the club and I think during the period he went through with his two injuries, he put so much work into it and the club supported him through it," he told the club's official website.
"He just goes from strength to strength. We said throughout last summer and January, we wanted to keep our best, experienced players, and this is another great example of that.
"The manager has said several times that as well as having a great, young squad, it's important we have experience and it's important we have characters. People like Lucas fit that.
"He'll tell you he's still very young, but in footballing terms he's experienced and a big part of the team."