Lionel Messi's Argentina will underestimate Iceland at their peril, coach Heimir Hallgrimsson warned on Friday, saying the minnows are ready to spring another surprise in Russian Federation. If you don't have cable you can stream it via Hulu with Live TV, or fuboTV.
Argentina have also topped their group in each of the last three World Cups.
Sampaoli, who has a reputation for unorthodox formations, seems to have settled on a 4-2-3-1 shape for Saturday's first game for the 2014 runners-up against tournament debutants Iceland, fielding two holding midfielders in Lucas Biglia and veteran Javier Mascherano.
Iceland may be the smallest country ever to qualify for a World Cup, but Sampaoli was not underestimating his opponents.
Manager Heimir Hallgrimsson said: Regarding Messi, I don't have a magic formula.
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Argentina have been training to try to combat Iceland's notable height advantage, and Sampaoli admitted the 6-centimetre difference remained a challenge.
"It's a strong team we're meeting tomorrow but our staff have done their analysis", he said. Everybody has tried everything against him and he always manages to score. They are drawn in Group D with Iceland, Croatia and Nigeria which is being considered as one of the toughest groups at this World Cup.
"I've said it would be unfair to give a player the role of marking Messi".
"I don't think this should be Messi's last World Cup".
Only Edinson Cavani (10) scored more goals than Lionel Messi (7) in the CONMEBOLqualifiers for the 2018 World Cup.
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Iceland midfielder Gylfi Sigurdsson returned from a knee injury in a friendly against Ghana last week.
Having fended off questions about why Lionel Messi had not fronted up at the press conference - Ajax left-back Nicolas Tagliafico was chosen instead - Sampaoli heaped praise on the Barcelona superstar and claimed players of his calibre changed a coach's thinking.
Iceland's best chance at any opening goal comes in the form of Alfred Finnbogason, who is an outside shot of 10/1 to get on the scoresheet first.
Hallgrimsson said his players' experience of Euro 2016 in France would help settle any nerves.
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