The Argentina international agreed terms on a new four-year deal on Friday afternoon, taking him to just short of a decade in North London if he sees it through.
Lamela featured 25 times for the Lilywhites last term after missing the majority of 2016-17 through injury, and the 26-year-old is remaining positive that he can stay away from the treatment room for good.
"It's difficult to be injured, especially for a long time, but I never gave up. Everything is in the past now," he told the club's official website. "To be strong mentally helped me a lot and now I'm ready to play and to enjoy.
"I'm training hard every day to be ready for the first game. Hopefully I stay like this, injury-free, for the whole season. I'm very confident this season will be good for me and for the team as well.
"I want to be scoring goals, playing well, fighting for the team, everything I can do I will do. I'm sure the team will be good next season."