Nelson is the second long-snapper Seattle has brought in this offseason to compete with incumbent Clint Gresham. Gresham has been very consistent for Seattle in his first three seasons but signed a $1.323 million tender offer as a restricted free agent and the Seahawks may not want to devote extra money to a long-snapper. They also gave Adam Steiner a look after he was released by Oakland in May.
Martin appeared in four games with one start for Seattle last season. He caught four passes for 42 yards for the season. Seattle still has 13 receivers on the roster heading into training camp.