In just the second Premier League match of Liverpool's season Lucas picked up a thigh injury and was ruled out for another three months, leaving him to cut a dejected figure on the sidelines again.
"This is the worst year of my career and of my life as well. When we can't do what we like to do and perform your job, it's always a bit frustrating," the 25-year-old told Sportv.
"Everything is a bit new to me because I have never had so many injuries. Two in a row is very complicated.
"We tried to stay positive when the first one happened, but the second one was much tougher as it happened so close to the other one."