Stokley, 37, was with the Denver Broncos last season and finished the year with 45 receptions, 544 yards receiving and five touchdowns.
Baltimore traded Anquan Boldin to the San Francisco 49ers and has already lost their receiving TE Dennis Pitta for the season. As things stand right now, Torrey Smith and Jacoby Jones are the Ravens top-two receivers, with Deonte Thompson and Tandon Doss competing for the No. 3 job. Stokley could provide them with some serviceable play out of the slot.