Career
He formerly played 6 games in the National Hockey League for the New York Islanders, Atlanta Thrashers and the Winnipeg Jets. On July 3, 2008, Mannino signed with the New York Islanders as an undrafted free agent. On July 6, 2009, Mannino left the Islanders and signed a contract with the Atlanta Thrashers.
On March 2, 2012 Mannino was acquired by the Pirates via loan from the Saint John's IceCaps.
During the 2012-2013 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 2014-2015 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.