He is 95% sure because there is a 95% chance no NFL teams wants him.
That is the harsh reality for an older NFL Running Back, so it is probably best he just makes it official himself. Probably a Hall of Fame lock even without a ring, was the undisputed best running back in the game for a few years.
Didn’t embarrass himself in the last two years with the Jets even though he will be remember as a Charger.