Good question but no

You can’t negotiate with a player who isn’t on your team (in any way that helps the salary cap)

Can’t get a player on your team until you trade for him

Can’t trade for him without the cap space to fit the deal the sending team sends out https://t.co/LlkMuoFZcX

— Greg Cover 1 🏈 (@GregTompsett) April 26, 2024