He said even though his side was easy to analyse, they are very difficult to beat.
Sweden are attempting to reach a first semi-final since 1994, when they were beaten 1-0 in the last four by eventual champions Brazil.
They saw off the Netherlands in qualifying and knocked out Italy in a play-off, before finishing top of a World Cup group featuring defending champions Germany.
Sweden remain one of the least fancied teams left in the competition, with little in the way of star power following the retirement of Zlatan Ibrahimovic after Euro 2016. Team coach Andersson said;
“I think there was a coach who once said about their team that they’re quite easy to analyse but quite difficult to beat. I think that’s a right description for us,”
“It shouldn’t be that difficult to get an idea of what we do.
“The surprise is probably that we’re terribly consistent,” he added. “Whether or not you take us seriously and how they perceive it, that’s very difficult for me to say.
“We’re really strong in our beliefs and we really have been from the outset.”
The 3-0 win over Mexico in Sweden’s final group match is the only time the Scandinavians have scored more than once in their past 11 official games.
They have kept three clean sheets in four outings in Russia but captain Andreas Granqvist will have his work cut out against Harry Kane, the leading scorer in the competition with six goals.