[1] While in college, Kolarac also played for the IMG Academy Bradenton of the Premier Development League in 2013, making 12 appearances.
[4] In 2014 following his college career, Kolarac trialed with the Colorado Rapids of Major League Soccer and was offered a contract by UMF Tindastóll of the 1. deild karla, the second division of football in Iceland.
[8] That season Kolarac was a staple in the midfield for the club starting 10 out of 10 matches as well as being the leading point scorer on the team with 3 goals and 3 assists.
Kolarac resigned with the Fort Pitt Regiment on May 1 for the 2018 season he was also named team captain for the squad.
[10] Kolarac led the Hotspurs to their first playoff berth in club history in 2021 with a 8–2 overall record in the Rustbelt conference.