Sinovic grew up in Leawood, Kansas to parents of Croatian descent,[1] and attended Rockhurst High School, and played college soccer at Creighton University from 2006 to 2009.

[3] He made his professional debut on March 27, 2010, in New England's opening game of the 2010 MLS season against Los Angeles Galaxy.

After being waived by New England, Sinovic went on trial with fellow Major League Soccer club Real Salt Lake in April 2011,[6] and played a couple of games in the MLS Reserve Division, but was not offered a contract by the team.

[8] However, five days later, Sinovic was shipped back to Kansas City with allocation money in exchange for Davy Arnaud.

He was honored as the Sporting Kansas City Defensive Player of the Year for his performance during the 2014 season.