Portugal will be looking to take a big stride towards qualifying for the last 16 but must be wary of a solid North Korea side.
Having played out a goalless draw with Ivory Coast in their opening Group G match, Carlos Queiroz's men will be targeting thee points against North Korea.
Portugal will not want to leave themselves needing to beat Brazil and Queiroz has promised a more attacking approach.
"We'll need to take more risks in our next match and that goes for both teams," he said.
"But it's always difficult to play against a team that stacks its defence and wais for its opponent to make a mistake."
Portugal may find it harder to break down a stubborn defence after Deco was ruled out with a hip problem that has prevented him from training.
Tiago might come in for Deco but it is Cristiano Ronaldo who will be expected to provide much of the inspiration and Queiroz has backed the Real Madrid star to score his first goal in a competitive international since Euro 2008.
There are unlikely to be many changes and goalkeepers Eduardo and Daniel Fernandes are both expected to be available following stomach upsets.
North Korea were written off as the rank outsiders in an otherwise difficult group before the World Cup started but will have been encouraged by their performance in a 2-1 defeat to Brazil.
It took Brazil almost an hour to open the scoring as North Korea defended resiliently, while they also showed enough in attack to suggest they cannot be taken lightly in their remaining matches.
Ji Yun-Nam scored for North Korea late on and Jong Tae-Se also impressed up front.
Tae-Se is now looking to find the target himself but accepts it will not be easy against another god side.
"I'm going to try to improve for the next game and score my first goal," said Tae-Se, who has been linked with a move to German side Bochum.
"Portugal are a top-class team, like Brazil, and it is going to be very hard but we're going to keep trying to make it."