By FOX Sports staff
The Thai Premier League giants head into Wednesday's second leg at the New I-Mobile Stadium trailing by a solitary goal from last month's opening encounter in Tehran, after Khosro Heydari's early strike handed the Iranian outfit the slimmest of leads.
However, Buriram displayed no nerves despite the intimidating atmosphere at the Azadi Stadium and created the better chances of the two sides, although they were ultimately unable to grab what could have been a vital away goal.
Nonetheless, Menendez, who was recently appointed as the Thunder Castle's new boss, believes his charges can do what is needed of them to book a place in the semi-finals.
"We are confident we can beat Esteghlal and the team is ready to beat Esteghlal," he said on the AFC's official website.
"We are confident that we can score. It will not be easy but we are confident we can score two goals.
"We will try to control the game and keep possession and we will try to play more offensive, but we also need to defend as we do not want to concede a goal.
"We believe we can go to the semi-final as we are the better team. We have prepared the team very well even though I have only been with the team for a few weeks."
The Spaniard also revealed he has not had to change much since taking over the reins from Englishman Scott Cooper, but admits he will have to manage his side carefully given the number of veterans they have playing key roles, including Suchao Nutnum, Suree Sukha and Surat Sukha.
"The team is in a good position and I have not changed a lot," Menendez added. "There are a lot of good things in place and I will only think about changes in the future.
"Some of the players are tired as a lot of the squad is older, but that is something that we will have to manage."
Like the ex-Racing Santander boss, Buriram captain Suchao also believes his side are in a good position to make the last four and should be spurred on by how well they did away to Esteghlal last month.
"We are ready and have an advantage as we will play at home," he said. "We are confident as we feel we dominated the first leg.
"We know that we need to score an early goal and I think we can score two goals.
"There is no pressure due to the history, we want to create a new history for the club and go to the semi-final."
Buriram will be boosted by the return of star left-back Theerathon Bunmathan from suspension.
Image courtesy of Buriram United FC