Ivačič was signed by
Portland Timbers on 18 January 2019. He made his debut for the club in a 6–1 victory over the
San Jose Earthquakes on 19 September 2020, earning three saves and giving up one goal. On 25 September 2023, Ivačič filed a complaint with the MLS Players Association against the Timbers alleging abusive conduct and tampering. A few days later, Major League Soccer announced it was suspending Ivačič for three matches and fining him an undisclosed amount for using threatening language toward team staff. Ivačič left the team in March 2024 after his contract was waived. On 23 April 2024, the
New England Revolution announced they had signed Ivačič through the 2025 season. He was named MLS Player of the Matchday for week 19, following the Revolution's 1–0 victory over the
New York Red Bulls in which he made five saves. He became the first goalkeeper to win Player of the Matchday award since
Dayne St. Clair in 2022, and the second Revolution keeper to win the award, following
Matt Turner in 2021. However, he was waived by the Revolution on 11 September 2025. ==International career==