Okam, who was a fifth-round pick in 2008 by Houston, played for the Texans (2008-10) and Buccaneers (2010-11). Palmer played the previous three seasons for Atlanta and has 21 catches for 123 yards and three touchdowns.
Horne, 26, was teammates with Victor Cruz at UMass and the 6-2 receiver stood out at rookie camp. So did Mertile and Stevenson. Mertile is a 6-1 rookie tryout from Florida International. Stevenson, who had an interception off Ryan Nassib in practice on Friday, is a 5-11 rookie safety from Georgia Southern.