Colts GM Ryan Grigson called WR Nathan Palmer "about as explosive a receiver we have."
It's high praise with T.Y. Hilton on the roster. Palmer was plucked off the 49ers' practice squad in September and appeared in five games, registering just one catch. At 5-foot-11, 195, he caught 47 passes for 695 yards and seven touchdowns as a senior at Northern Illinois in 2011. With Donnie Avery and Austin Collie set for free agency, Palmer will compete for an increased role in 2013.