South Korea coach, Kim Eun-joong has highlighted why Nigeria is a difficult team to beat.

On Thursday, South Korea defeated Ecuador 3-1 to set up quarter-final meeting with Nigeria.

The Asians side are hoping to reach the last four, but must get past the Africans who defeated hosts Argentina.​

Speaking after his side’s win over Ecuador, Eun-joong admitted his players must be at their best to beat the Flying Eagles.

“When I watched the game against Argentina yesterday, the Nigerian team seemed to be very well prepared,” Eun-joong was quoted by Chosun.

“Players in all positions are physically outstanding and have flexibility. We will do the analysis properly.”​

Both side will clash at the Estadio Único Madre de Ciudades in Santiago Del Estero on Sunday.