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After going undrafted in the 2010 NFL Draft, Bush signed with the Atlanta Falcons on April 26, 2010. He was released on September 4, 2010 and signed to the Falcons' practice squad the next day. The team promoted him to the active roster on December 29, 2010. He was released during final cuts on September 3, 2011, but re-signed to the practice squad the following day.
On September 1, 2012, Bush was signed by the New Orleans Saints. Bush is noted for wearing #25 with the team, which was notably worn by Reggie Bush during the latter's tenure with the team.
Bush was a restricted free agent after the 2013 season, and he signed an offer sheet with the Falcons that would have returned him to Atlanta for reported compensation of about $4.5 million for two years. However, on April 7, 2014, the Saints exercised their right to match the Falcons' offer and bring Bush back to New Orleans.