The rumor stems from this link and is said to have come from Peter Vescey:
I personally do not think that anyone will want to roll the dice on a player like Nene at this stage of the game. I would love it, but let’s be honest… He has a 60 million dollar contract, is out of shape, and is nothing but a huge question mark right now when his knee is concerned. If there is a team willing to throw their fate in the wind we should see if they want to take Kenyon Martin too! The Nuggets could sure use some draft picks, or young talent at center. Marcus Camby isn’t going to be able to play forever and it would appear that center is our most shallow position.