Carriker tore the quad tendon in his right knee in the second game of the 2012 season and hasn't played since. He's had three surgeries on the knee and has been aiming for a comeback in 2014.
Carriker was a first-round draft pick by the St. Louis Rams in 2007. The Redskins acquired him in a trade in 2010.
Rocca, a 40-year-old former Australian Rules Football star in his native country, had a disappointing year in his third season with the Redskins. His 33.8-yard net average ranked last in the NFL.
The Redskins on Tuesday also released tight end Richard Quinn and waived running backs Jawan Jamison and Davin Meggett.
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