Defending champions Al Hilal will take on Al Duhail for a place in the Asian Champions League final after Ramon Diaz's side earned a late 1-0 win over Iranian team Foolad in Doha.

Moussa Marega struck three minutes from time to take Saudi Arabia's Al Hilal into the semi-finals, where Qatar's Al Duhail await after a double from Michael Olunga secured a 2-1 victory over Al Shabab.

The winners of Sunday's clash will face Japanese side Urawa Red Diamonds - who secured their place in the decider last year - in a two-legged final on April 29 and May 6.

Al Duhail, the Qatar Stars League leaders, will be appearing in the semi-finals for the first time after Olunga scored two late goals to earn his side victory at Al Thumama Stadium.

"It's a beautiful feeling to help the team with the goals, to score two goals," Olunga said.

"It's amazing and this is something positive, it gives me confidence to go on fighting for the team.

"We just want to continue working as a team and post better results."

The Kenyan gave Al Duhail the lead 13 minutes from time when he steered Nam Tae-hee's corner from the right past Al Shabab's South Korean goalkeeper Kim Seung-gyu with a well-taken downward header.

He doubled the advantage eight minutes later, netting after Ismael Mohammed's low cross from the right found the former Kashiwa Reysol striker unmarked to side-foot the ball home.

Saeed Al Rubaie pulled one back for the Saudi side three minutes into added time, volleying in Fawaz Al Saqour's cross from close range to give Al Shabab hope but Al Duhail hung on.

Al Hilal, meanwhile, survived a late scare when Foolad defender Mohammad Amin Hazbavi rattled the crossbar with a header before Marega earned his team a barely deserved win in the 87th minute.

Substitute Saleh Al Shehri slipped the ball into the path of Marega and the former Porto forward charged into the penalty area to strike a right-foot shot across goalkeeper Christopher Knett and into the far corner.

The win kept alive Al Hilal's hopes of a record-extending fifth Asian title, and a third in four seasons.