While he was reportedly offered a significant pay cut to stay, Nelson told ESPN Milwaukee that it was more than just the number that hurt.
"I met with Brian and had a discussion because I had to get a feel for not just the pay cut but what their plans were going forward. After that meeting, there wasn't, I don't think, much desire there. I think with the combination of both, we decided what was best for myself and my family [just] as they decided what was best for them and the Packers."
Nelson says the meeting was disappointing. "I think the hurt part was, to be honest, was the unwillingness to try to make it work."
The 10-year veteran has 550 catches for 7,848 yards and 69 touchdowns on his Packers resume, including a league-leading 14 in 2016. Last week, he thanked his fans for their support through the years on Twitter.
In Oakland, Nelson will be reconnected with former Packers front office executive Reggie McKenzie as general manager, and his former Green Bay receivers coach, Edgar Bennett.