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During the 1998–99 Croatian football season, Croatia Zagreb competed in the Prva HNL.
Season summary
Croatia Zagreb made their debut in the Champions League group stage, drawn against Olympiakos, Porto and Ajax. Zagreb failed to win any of their first three group games, resulting in the departure of manager Zlatko Kranjčar. His replacement, Velimir Zajec, inspired a turnaround and wins against Porto and Ajax gave the club hope of reaching the quarter-finals. A home draw with Olympiakos in the final group stage match saw Croatia Zagreb finish second in their group, but as they were the lowest-ranked of all the group stage runners-up they did not progress.
In the first round of the Croatian Football Cup the club was sensationally knocked out by fourth-level amateur side NK Dugo Selo 3–2.
In the league, Croatia was unbeaten in the first 11 matches of the season. Their first defeat came in November against Rijeka. They ended the first stage of the championship in March on top of the table, with a single point ahead of Rijeka, and 11 points ahead of their biggest rivals Hajduk Split in third place.
In the championship playoff, played as a round-robin mini-league involving top six teams from the first stage, Croatia finished on top, winning their fifth Croatian title since the country's independence, and ninth national title overall.
First-team squad
Squad at end of season
Note: Flags indicate national team as defined under FIFA eligibility rules; some limited exceptions apply. Players may hold more than one non-FIFA nationality.
Note: Flags indicate national team as defined under FIFA eligibility rules; some limited exceptions apply. Players may hold more than one non-FIFA nationality.