As a freshman at Valparaiso, Ognacevic appeared in 28 games and averaged 6.3 points per game, before entering the transfer portal. He transferred to Lipscomb University and in his debut with the Bisons, he totaled 30 points and seven rebounds in a win over Birmingham–Southern. In Ognacevic's first season with Lipscomb, he made an instant impact. After averaging 17.7 points per game during the 2022–23 season, he suffered a knee injury and was forced to take a medical redshirt and miss the entirety of the 2023–24 season. He returned to Lipscomb for the 2024–25 season and emerged as the Atlantic Sun Conference's leading scorer.