Undrafted, Sifers played collegiate hockey with the
University of Vermont in the
Hockey East before making his professional debut at the end of the
2005–06 season with the
Toronto Marlies of the AHL. On July 28, 2006, Sifers signed a two-year entry-level contract with the
Toronto Maple Leafs. In
2008–09, his third season within the Maple Leafs organization, Sifers would make his NHL debut with the Maple Leafs, playing in 23 games while registering 2 assists. On July 8, 2009, Sifers signed a one-year contract with the
Minnesota Wild organization. After making the opening night roster for the Wild to start the
2009–10 season, Sifers played the majority of the year with AHL affiliate, the
Houston Aeros. Sifers would play 14 games collectively throughout the season with the Wild. On July 2, 2010, Sifers signed a one-year contract with the
Atlanta Thrashers organization. He was assigned to their AHL affiliate, the
Chicago Wolves for the entirety of the
2010–11 season. On May 26, 2011, Sifers left the NHL and signed a one-year contract with
German club,
Adler Mannheim of the
Deutsche Eishockey Liga. After three seasons in Germany, Sifers opted to return to North America, signing a one-year deal as a free agent with the
Springfield Falcons of the AHL on July 3, 2014. Playing with the affiliate of the
Columbus Blue Jackets, Sifers appeared in every game for the Falcons on the blueline, contributing with 22 points in the
2014–15 season. On July 2, 2015, Sifers was signed by the Blue Jackets, to a two-year, two-way contract as a free agent. Following the completion of his two-year deal with the Blue Jackets, Sifers left the
Cleveland Monsters as a free agent. He agreed to continue his career in the AHL, signing a two-year deal with the
Utica Comets, an affiliate to the Vancouver Canucks, on July 13, 2017. Upon the conclusion of his contract with the Comets at the end of the
2018-19 regular season, Sifers opted to conclude his 13-year professional career, announcing his retirement on April 15, 2019. ==Career statistics==