Croatia enters the round of 16 with tons of confidence as the victor of Group D over pre-tourney favorites Argentina.
A win or a draw against Iceland clinches first place for Croatia, and they still likely would top the group even if they lost and Nigeria won because the African nation would need to make up a five-goal deficit in the goal-differential tiebreaker.
The World Cup match between Iceland and Croatia will be broadcast live on FS1.
Iceland could have finished second in the group with a victory because Argentina beat Nigeria 2-1 at the same time.
Croatia secured first place in Group D on Tuesday (Jun 26) after a hard-fought 2-1 win over gallant Iceland in Rostov, setting up a last-16 tie with Denmark.
Iceland had to win all three points to have a chance of progressing into the last 16.
"We did everything we could, if you do that you can't be disappointed, we can look each other in the eye and can carry our heads high", said Iceland coach Heimir Hallgrimsson afterwards.
"It was a bit of a shock to concede one, but we did not give up", he said. That shows the character of the players; we left everything behind.
As expected, Croatia controlled midfield and Iceland were perfectly happy with the scenario, looking to hit their opponents on the break.
Croatia had their first clear chance when Badelj's missile crashed onto the bar six minutes into the second half.
It's around this time, on the eve of the knockout stages, that theories are being formulated for who will impress moving on at the World Cup, and though England have garnered attention, it's Croatia who are the real lurkers in Russian Federation. Rakitic came close with a free-kick and Kramaric shot just wide from inside the box before Perisic scored the victor in the 90th minute with a left-foot shot past the Iceland keeper.
Unlike in their first two matches against Argentina and Nigeria where they were more solid at the back, it was Iceland who were on the front foot and had the best of the chances against the Croats.
Argentina supporters in Buenos Aires react to Marcos Rojo's game-winner late in the second half against Nigeria.
Iceland equalized in the 76th when Gylfi Sigurdsson scored from the penalty spot after substitute Dejan Lovren handled the ball.
Iceland challenged almost immediately, with a first headers by Ingason tipped over the crossbar by Kalinic and a second glancing off of it.