The 26 year old midfielder played in nine matches, five of those in the starting line up, for Kansas City. Sassano scored one goal during the 2011 campaign.
2012 will be Sassano's fifth in Major League Soccer. He spent the first three seasons of his MLS career playing for the New York Red Bulls, where he made 42 total appearances for the Red Bulls during his time there. Sassano suffered a right ankle injury that required season ending surgery his last season with New York (2010). He was then selected by the Galaxy in the Re-Entry Draft Process.
Sporting acquired Sassano in 2010 in a trade with the LA Galaxy in exchange for the rights to Frankie Hejduk.
Per club policy, terms of Sassano's deal were not disclosed.