Former Portugal national team boss Humberto Coelho believes the European nation should be wary of North Korea at this year's World Cup.

Coelho, who also coached the South Korean team, understands just how dangerous Asian football nations can be and has urged Portugal to remain cautious of North Korea when they meet in Group G in South Africa.

"Asian football is a very generous type of football," Coelho told Goal.com.

"The players may lack the technical skills, but they're not selfish and are usually well conditioned and tactically very aware. I believe that the surprise may actually come from North Korea, so therefore we need to be careful and remain focused when playing against them."

Portugal, who are now managed by former Manchester United assistant Carlos Queiroz, have also been drawn against world number two Brazil and strong African nation Ivory Coast.