If the Giants are smart, they get him in front of ownership and tell him the following. We need to trade you to get picks. However, we want to sign you immediately in the off-season. Don't sign with the team we trade you to. Give us the chance to sign you back. You will have a better career here if we can draft a good OL or LB with those picks.
That's the way I would play it. There will be a bidding war for Nicks and they very well might get a first for him. Remember, 95% of all GM's are stupid. They are little children who get in these moronic competitions for players they consider prizes. They also get fired when they don't win. So, they really don't care as much about the future as you think. They care more about saving their job.