Klemmer signed a five-year deal with the Knights on Monday afternoon, with Napa signing a three-year contract with the Bulldogs soon after.
“Dylan, has played on the biggest stages and experienced success at Origin and Grand Final level and we are confident that he can bring that uncompromising and winning mentality to the Bulldogs,” Bulldogs Chief Executive Andrew Hill told the club’s website.
Bulldogs coach Dean Pay was also excited about the new recruit.
“Signing someone of Dylan’s toughness and ability is a major coup for the club. We really feel that we have got a high calibre footballer who will be a great addition to both our pack and our playing group as a whole,” Pay told bulldogs.com.au.
Napa has played 122 games for the Roosters over the past six seasons.