Mottau played four years of college hockey at Boston College, and was the recipient of the Hobey Baker Award for top men\'s collegiate hockey player during his senior season. He made his National Hockey League debut with the Rangers during the 2000–01 season. He played nineteen games with the Rangers over two seasons, and four with the Calgary Flames during the 2002–03 season. Mottau played four seasons in the American Hockey League before returning to the NHL in the 2007–08 season with the New Jersey Devils. On September 28, 2010, Mottau signed a two-year deal with the New York Islanders.\n', '

On February 27, 2012, Mottau was traded with Brian Rolston to the Boston Bruins in exchange for Yannick Riendeau and Marc Cantin.\n', '

With the 2012–13 NHL lockout negating his chance of a NHL contract, Mottau was signed to a professional try-out deal with the San Antonio Rampage of the AHL on December 7, 2012. Mottau produced 7 assists in 16 games before he was released at the conclusion of the lockout to sign a one-year contract with the Toronto Maple Leafs on January 13, 2013.\n', '

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