"I just couldn't sleep well last night because of the match (against Northern Ireland)," said Jeonbuk Hyundai Motors midfielder Lee Jae-sung, who played full time against Northern Ireland. "Because we traveled a long way to play here, we want to collect a good result. We'll show things that we've been preparing and perform better."

Red Bull Salzburg forward Hwang Hee-chan said he also got a feeling that they can have a better game against Poland. Hwang played 30 minutes against Northern Ireland as a second half substitute.

"If we can make more runs and learn things on the pitch, we'll do better," he said. "I have no personal goals. I just want to help our team collect a victory."

Kim Min-jae said he will not make the same mistakes that he showed against Northern Ireland. The 21-year-old center back, who plays for Jeonbuk, put the ball into his own net to deadlock the score 1-1 during the match in Belfast. 

"I learned that I still need to improve and have to concentrate more," he said of the match against Northern Ireland. "I think our attackers did well, but defenders weren't good."

Kim, who has six international appearances, said he will make improvements.

"I have to play with a do-or-die mindset against Poland," he said. "It feels sad that I've disappointed many fans in the friendly against Northern Ireland, but I'll show a better performance next time." (Yonhap)