Read our preview of the matches here.
Despite taking 11 shots, his World Cup-career high, Messi has also now failed to score in his last five games on the world's biggest stage, after finding the net in each of the group stage games in 2014.
"He can carry the team on his shoulders", Sampaoli said of the player who scored 45 goals in 54 games for Barcelona this season. This is largely because the team is so heavily reliant on him, as shown by their qualifying campaign.
Messi's record going into the tournament been suspect recently too, as reported by the Metro, it was his fourth miss from his last seven attempts for club and country which is only a success rate of 57%.
Next up for Iceland is a clash with Nigeria, which takes place next Friday.
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If your team scores in the first five minutes, get paid out as a victor! "We studied Iceland and have prepared accordingly".
"We have a lot of discipline in the way we play", he said.
"Maybe we needed to be more creative in the first half".
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While global honours have so far eluded Messi, France coach Didier Deschamps is using his experience of winning the 1998 tournament to prime a talented but youthful side.
Australia, will do well to test France who are better than them across the field, but who knows, maybe France could fail to live up to their hype and expectation. "We will learn from what happened and we have to have the strength to win the next game".
The Barcelona star fired wide late on and had a pair of efforts saved in the first period, but could not find a way through the determined Iceland defence.
Argentina has played 4 games against Croatia, won two, lost one and tied one.
Who knows, maybe Australia will shock the world in Russian Federation...
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"We all are sure that there will not be any problems for the Nigerian players because the atmosphere we felt already arriving in Russian Federation was very good", he said.