The Tennessee Titans initially signed Adrian Peterson to the practice squad with the intent of elevating him to the active roster at some point. Apparently, some point is today. The Titans are signing Peterson to the active roster today according to Mike Garafolo of NFL Network:
The #Titans are signing RB Adrian Peterson to the active roster today, source says. This is not a weekly practice-squad elevation. This is a permanent move to the active roster. He’s impressed them that quickly that it’s go time already.
— Mike Garafolo (@MikeGarafolo) November 5, 2021
The Titans clearly had eyes for Adrian Peterson from the beginning.