[1] He was born into an athletic family as his uncles Blair and Tony MacDonald were active within the National Hockey League (NHL).
Blair played 219 career NHL games with the Edmonton Oilers and Vancouver Canucks while Tony is the director of amateur scouting for the Carolina Hurricanes.
[1][3] During the 2013–14 season, he had tallied 15 goals and 15 assists before signing a standard player agreement with the Owen Sound Attack of the Ontario Hockey League (OHL).
[4] Following the signing, Gadjovich, and teammate Victor Mete were selected by Hockey Canada to participate in their 2014 National Under-17 Development Camp.
[9] During a game against the London Knights, Gadjovich recorded his fourth hat-trick of the season to help the team qualify for the 2017 Ontario Hockey League Playoffs.
However, he did not compete in the Canucks' Summer Showcase game at Rogers Arena as he was recovering from a wrist injury suffered during the OHL playoffs.
[17] He later scored his first professional goal on November 9 in a 4–3 shootout win over the Hartford Wolf Pack to lead the team to a 5–3–1 record.
[20] Due to various injuries and illness throughout the shortened season, Gadjovich was held to only 38 games but he still set career-highs with 13 goals and four assists for 17 points along with 32 penalty minutes.
In May, he led the Comets with 15 goals and earned his first career NHL call-up after recording a Gordie Howe hat trick.
[29] Leaving the Sharks organization after two seasons, Gadjovich initially signed a one-year AHL deal with the Charlotte Checkers on July 2, 2023.
Remaining with the team through pre-season and before making an appearance with the Checkers, Gadjovich was signed to a one-year, $810,000 contract with the Panthers on October 17, 2023.