NRL.com broke the news on Monday afternoon, believing the Bulldogs released Klemmer from the final two years of his deal in order to take a five-year, $4.3 million deal from the Knights.
With Klemmer on his way out,Roosters premiership-winning prop Dylan Napa will replace the Blues enforcer at the Bulldogs.
“David is one of the world’s best front rowers and his signing is an enormous coup for us,” Knights CEO Philip Gardner told newcastleknights.com.au.
“He’s been very upfront about the fact he sees a lot of potential in the Knights. He wants to win a Premiership and he sees himself doing it here. That is a massive vote of confidence in the direction of our side and our club.
“What’s more, in signing David we welcome a quality individual, not just a quality player.
“He is a family man and a good person. He and his wife Chloe and their three boys are coming not just for football but for the quality of life Newcastle offers.”