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.

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

[3] 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.

[4] On July 5, 2013 the Florida Panthers Executive VP & General Manager Dale Tallon announced that the club has agreed to terms with D Mike Mottau on a one-year, two way contract.

[6] Following his retirement, Mottau has worked as a Business Development Manager for Sunrise Erectors.