It's possible that the New York Giants use the transition tag on safety Xavier McKinney, per Paul Schwartz of the New York Post:
"They will negotiate with McKinney's representatives and if a deal cannot get done — there is no reason to believe an agreement will be reached — they have until March 5 to apply the lesser-used transition tag on him. That is a possibility, the Post has learned.
"It would cost the Giants $13.9 million, a nice savings from the franchise tag. The transition tag allows the player to negotiate with any other team and come up with a deal, with the Giants having the ability to match that offer sheet and retain the player.