[1] Rešetar made his professional debut at the age of 17 while playing for NK Inter Zaprešić in the Croatian First Football League1.
He went on to make nine appearances for Zapresic in the 2017–18 season, scoring his first professional goal in a 3–3 draw with NK Slaven Belupo on April 19, 2018.
In the 2019–20 season, Rešetar played in seven games for Dinamo Zagreb II, tallying the game-winning assist against NK Kustošija on Oct. 20, 2019.
[2] On January 22, 2020, Resetar joined teammate Petar Čuić as they both sent on loan to USL Championship side Sporting Kansas City II ahead of their 2020 campaign.
[3] On the international stage, Rešetar has made 10 appearances for Croatia's Under-19 team, scoring three goals – two against India on Sept. 4, 2018 and another against Slovenia four days later in a set of friendly matches.