"The first time you get drafted into the AFL it's really exciting, but I think the second opportunity meant a lot more," Campbell said.
"I've got a lot of footy left to play and a lot to give and I just felt like I didn't quite get the opportunity to show it. For North Melbourne to show the faith in me and give me that chance, it just means so much."
Campbell says his relationship with former Bulldogs teammate Will Minson, now ruck coach with the Kangaroos, played a significant role in his move to the club.
"It's been fantastic to re-engage with him and work with him in a different professional capacity," Campbell said.
"I think he really advocated strongly for me and I came in and had a meeting with Cam Joyce and Brad Scott, and things moved fairly quickly from there."