Croatia's Mario Mandzukic does not look comfortable and walks out of the pitch. A poor second half saw Nicolai Jorgensen strike an effort straight at Croatia goalkeeper Danijel Subasic as the game move in to extra-time.
Asked about Eriksen, Modric said: "I don't like to compare players, particularly to compare others with myself".
Neither could force a victor during extra-time either, with Kasper Schmeichel saving a 116th-minute penalty from Modric, meaning spot-kicks were required.
It wasn't until late on in extra time, and then the subsequent penalty shootout, that the game was given a dramatic conclusion, with Croatia setting up a quarter final meeting with Russian Federation.
"It's seldom that we play like this, and the game against Croatia will be a very different spectacle".
Striker Yussuf Poulsen returned for Denmark after suspension.
After some comical defending at both ends and goals from Mathias Jorgensen and Mandzukic, the match became a tense affair with neither side giving much away. But Denmark, unbeaten in 18 games coming into the game, provided tough opposition.
Six of Croatia's seven goals at this year's World Cup have been scored in the second half.
"Since going down 1-0 to Montenegro, we have not lost, and I think we have built something good since then". Two goals was all they could muster in their three group games, one each against Australia and Peru but in Christian Eriksen they possess a talent unmatched in Danish football since the days of Michael Laudrup.
Croatia celebrate their round of 16 Fifa World Cup win over Denmark.
"I am so sorry for Kasper and the whole team", Denmark coach Age Hareide said.
Jorgensen fired a low effort at the goalkeeper after turning well inside the area with Denmark now looking the more unsafe, and Eriksen dragged a half-chance wide soon afterwards. It must be buzzing in Croatia at the moment because they have been excellent in this tournament so far.
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