As a youth, Mannino played in the 1998 Quebec International Pee-Wee Hockey Tournament with the Detroit Honeybaked minor ice hockey team. Mannino later played as a goaltender for the University of Denver where he led the Pioneers to the 2005 NCAA Championship and Tri-City Storm of the United States Hockey League where he helped them win the Anderson Cup in 2004. On July 3, 2008, Mannino signed with the New York Islanders as an undrafted free agent. He earned a win in his first NHL start with the New York Islanders on March 15, 2009, a 4-2 victory against the Chicago Blackhawks. On July 6, 2009, Mannino left the Islanders and signed a contract with the Atlanta Thrashers. . On January 12, 2012 Mannino was reassigned to the Chicago Express of the ECHL by his parent club the Winnipeg Jets. On March 2, 2012 Mannino was acquired by the Pirates via loan from the St. John's IceCaps. During the 2012–13 season, Mannino signed an AHL contract with the Manchester Monarchs, top affiliate of the Los Angeles Kings, he signed a one-year agreement on December 4, 2012. In 20 games with the Monarchs, Mannino posted 10 wins. On July 24, 2013, Mannino remained in the AHL agreeing to a one-year contract with the Wilkes-Barre/Scranton Penguins. A free agent into the 2014–15 season, Mannino initially signed with the Toledo Walleye before he was released to sign with fellow ECHL club the Kalamazoo Wings on October 24, 2014. After one games with the Wings, Mannino returned to the Portland Pirates of the AHL on a try-out contract on November 18, 2014. He was released by the Pirates after three games with the club and later signed for the remainder of the season with the Binghamton Senators on December 27, 2014. On June 18, 2015, Mannino announced the conclusion of his professional career after 7 seasons in accepting an assistant coaching position on the Chicago Steel of the USHL.
Coaching career
Chicago Steel
On June 18, 2015, Mannino was announced as an assistant coach for the Chicago Steel of USHL.
On June 4, 2019, Mannino was announced as head coach of the Des Moines Buccaneers. On July 28, 2020, the Des Moines Buccaneers announced Mannino was promoted to Head Coach & General Manager.
