In the 2020–21 season, after the first choice point guard Scottie Reynolds was sidelined due to injury, Gnjidić unexpectedly got much more time on court.

His good plays attracted the attention of the Montenegrin Mornar Bar, which tried to sign him during the Summer of 2021.

After a lot of rumour and press reports of his transfer, he eventually decided to stay in Cibona.

[5] Gnjidić played for the Croatian national basketball team youth selections.

Gnjidić debuted for the Croatian A team in November 2021 at the 2023 FIBA Basketball World Cup qualification game against Slovenia.