The two sides have already met recently in the K-League with that game ending goalless and Seongnam coach Shin Tae-yong knows it will once again be a difficult encounter.

"From now, the fixtures in the Asian Champions League are tough and Suwon is a very tough team," he said.

"Suwon have been playing well and getting good results lately but I am sure that we can get a good result too."

Suwon coach Yoon Sung-hyo has concerns over the state of the Tancheon Sports Complex pitch, however, and believes it will make it difficult for his side to play as well as they are capable of.

"The key point in this game is how well we adapt to the pitch," he said.

"We have examined it and it is not much different than two weeks ago. It will not be easy for us to play our passing game but we will prepare as well as we can."

Jeonbuk Hyundai Motors are one of South Korea's other representatives in the last eight and they host Saudi Arabia's Al Shabab at Jeonju World Cup Stadium.

Jeonbuk are former winners of the tournament having lifted the trophy four years ago and coach Choi Kang-hee is eager to lead his side to success again.

"We are challenging for the champions of Asia again," he said.

"This game could be a watershed moment in the pursuit of our dream. We have trained hard to beat our opponent. I am sure it will be a good match."

Al Shabab coach Jorge Fossati does not believe the club's disappointing domestic form will affect their chances of progressing on the continental stage.

The Riyadh club have picked up just four points from four games but Fossati feels he has seen enough from his players in recent weeks to be convinced they can get a positive result in Korea.

"I want my players to go out with a strong desire and to win the game," he said.

"I understand Jeonbuk are a good side but we have prepared well for them. My players are also showing good form."

Pohang Steelers are South Korea's fourth and final representative still in the tournament as they look to keep alive their hopes of defending the title they won last year when they tackle Zob Ahan in Iran.

Park Chang-hyun's side have had a year to forget having lost a number of key players a well as enduring a mini-slump in the K-League with two successive defeats.

"We have to show everyone why we became champions," he said.

"We've changed our coach and at the moment we're okay. I hope that these changes will see us gain better results."

In contrast to South Korea, Iran's sole representative in the tournament is Zob Ahan and coach Mansour Ebrahimzadeh is determined to bring continental success to the country.

"All the focus in Iran will be on us tomorrow and this is something which we care about more than anything else," he said.

Finally, Saudi side Al Hilal host Al Gharafa of Qatar and coach Eric Gerets knows it is vital that his side secure a big victory to give themselves the best chance of reaching the semi-finals.

"We will take things seriously and hopefully we can play with confidence and score a lot goals while we will try to avoid conceding any goals, especially in this game in Riyadh," he said.

Opposite number Caio Junior is equally determined to secure a positive result ahead of the return leg in Qatar.

The game marks Al Gharafa's first competitive game of the season with their domestic campaign not getting underway until Sunday.

"Playing against Al Hilal in our first official match will not affect us," said Junior. "Our team is ready technically and morally for this big clash especially because this is the first time that we have managed to reach the final eight of the competition."