The match ultimately went to a shoot-out, where Croatia goalkeeper Subasic stood out with three saves to ensure his side advanced to the quarter-finals, where they will face host nation Russian Federation.
Denmark goalkeeper Kasper Schmeichel makes the save of the day as he dives to stop Luka Modric's penalty kick.
Croatia players celebrate after winning against Denmark.
First, Mathias Jørgensen turned home in the second minute after Croatia failed to clear a long throw-in from Jonas Knudsen, the defender's shot creeping under Subasic to give Denmark the ideal start.
Danijel Subasic saved three penalties to help Croatia reach the World Cup quarterfinals with a 3-2 shootout victory over Denmark following a 1-1 draw on Sunday.
39' - A set piece for Croatia nearly results in a goal.
Welcome to 1 NEWS NOW's live coverage of the 2018 Football World Cup from Russian Federation.
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Zlatko Dalic's side will undoubtedly dominate possession in Nizhny Novgorod, and Denmark's defence will have to be well organised to keep Croatia out.
Given Croatia's likely dominance in possession, Denmark will have to rely on their defensive solidity and ability to be clinical on the counter-attack. Croatia will get a penalty kick. The score would remain locked at 1-1 until the end of extra time some 120 minutes later, including injury time. Eriksen however, remains their only realy player possible of creating the magic needed to put the ball in the back of the net.
Modric, who has already scored two goals, will be expected once again to pull the strings for Croatia from midfield. If Croatia's golden generation are to take this golden opportunity, they must improve on this.
Rebic, along with Andrej Kramaric and Ivan Perisic may feature ahead of the midfield duo of Modric and Rakitic. Of Denmark's two goals at the tournament so far, Eriksen has scored one and assisted the other, which gives an idea of his importance to the team.
Luka Modric, the Real Madrid maestro who pulls the strings at the heart of the Croatia midfield, has been one of the best players so far in Russian Federation and Denmark will have to limit his influence to introduce any of their own.
- Denmark's knockout stage matches in the World Cup have produced 4.75 goals per game (19 goals in 4 matches).
Denmark - Schmeichel 8, Knudsen 7, Jorgensen 6, Kjaer 5, Dalsgaard 6, Delaney 5, Christensen 5, Braithwaite 6, Eriksen 6, Poulsen 7, Cornelius 5.