The veteran goalkeeper moves to New York for a fresh challenge as the Brazilian defender heads back to his homeland after failing to break into Michael Oenning's side
The 38-year-old shot-stopper has moved to the MLS outfit on a free transfer and is eagerly anticipating the new challenge which the United States offers him.
Rost told the New York Red Bull's official website: ''I look forward to the challenge of the land, the language, and the league.''
The keeper spent a glittering career in Germany which included spells at Werder Bremen, Schalke and eventually Hamburger.
Meanwhile Alex Silva has returned to Brazil and has joined Flamengo on a free transfer, according to the Brazilian club's official website. The 26-year-old arrived in Germany in 2008 but was unable to cement a first-team place at the Imtech Arena, making just 17 appearances during that time.
However, he enjoyed a successful loan spell with Sao Paulo last season and has opted to join Flamengo to end his stint at the Bundesliga club.