Career
As 15-year-old, Rendulić made his profeesional debut with hometown club, KHL Medveščak in the Croatian Ice Hockey League during the 2006-2007 season. He signed for Ässät in 2008 and played for their U18 team and then their U20 team On 25 January 2011, he was loaned for the remainder of the 2010-2011 season to former club Medveščak, now of the Austrian Hockey League.
Rendulić featured in 12 games with Zagreb, collecting a goal and an assistant
Upon returning to Ässät, he finally made his debut for the men"s team during the 2011-2012 season, playing three games whilst also enduring another loan spell, with SaPKo in Mestis. On 8 May 2012, out of contract with Ässät, Rendulić agreed to a try-out contract with fellow Liiga club, HPK. With a developing, larged-framed body, Rendulić"s initial trial with HPK was successful, earning him a one-year contract on 31 August 2012.
In the 2012-2013 season, Rendulić predominantly played with HPK in a depth forward role to finish with eight goals in 37 games. Rendulić was signed to a one-year extension and in the following 2013-2014 season, he played his first full Liiga season with HPK, establishing a top-nine position to produce career highs of 11 goals and 32 points in 57 games.
On 19 May 2014, Rendulić"s successful season earned National Hockey League recognition, and he was subsequently signed to a two-year entry level contract with the Colorado Avalanche.
In signing with the Avalanche, Rendulić became the first Croatian born and trained player to earn an National Hockey League contract. After his first training camp and pre-season in Colorado, Rendulic was assigned to begin the 2014-2015 season with Colorado"s American Hockey League (AHL) affiliate, the Lake Erie Monsters. On 9 December 2014, he received his first National Hockey League recall by the injury-hit Avalanche.
He became the first Croatian born and trained player to also play in the National Hockey League, playing on the Avalanche"s fourth-line in a 3–0 defeat to the Nashville Predators.
Immediately after his second recall to the Avalanche, Rendulić scored his first National Hockey League goal in his fourth game on 31 December 2014, against Steve Mason of the Philadelphia Flyers.