The three-time champions opened their campaign on a high note, defeating Yemen 5-0 on Monday, but Ghoddos admitted Iran had gone into the match nervous.

"It’s not easy to play the first game in a tournament. It’s always stressful and nervous and you’re trying to do your best so sometimes the play can be a bit stiff, but we showed a good result by scoring five goals and keeping a clean sheet.

"So that’s very important and we have big confidence in the team now," said the midfielder, who plays for Amiens SC in the French Ligue One.

The 26-year-old Al Gharafa favourite scored twice on a night when the three-time Asian champions were rarely troubled by opponents making their debut in the competition as a unified nation.

Iran’s impressive victory saw them assume pole position in Group D, a flying start that Taremi believes will stand his side in good stead going forward.

In a tournament that has already witnessed several surprise results – notably Jordan’s defeat of Australia – the Portuguese tactician was thankful that the three-time champions of Asia avoided any sort of upset at the start of their Group D campaign.

Instead, Mehdi Taremi’s brace along with goals from Ashkan Dejagah, Sardar Azmoun and Saman Ghoddos helped seal a relativy straightforward victory and a provide a perfect start to Team Melli’s 14th AFC Asian Cup campaign.

Mehdi Taremi scored twice as the three-time AFC Asian Cup champions, who reached the quarter-finals last time out in Australia, excelled throughout and underlined their title credentials in what is their 14th consecutive appearance at Asia’s premier competition.

Iran’s success sees them go top of the Group D standings ahead of Tuesday’s encounter between fellow group hopefuls Iraq and Vietnam.

Originally named as a substitute, the livewire Tareq was brought on in the 58th minute and duly netted a vital equaliser just two minutes later courtesy of a thunderous finish.

With the Esteghlal star to the fore, Iraq pressed for a winner and their persistence paid handsome dividends when Ali Adnan converted a last gasp free-kick to seal all three points for the Lions of Mesopotamia.

Champions in 2007, Iraq had been behind twice before Adnan’s sublime set-piece secured all three points for Srečko Katanec’s relieved charges against a highly rated Vietnam side at Abu Dhabi’s Zayed Sports City Stadium.

At a competition where, so far at least, several of the region’s powerhouses have had things far from their own way, the victory saw Iraq go second in the Group D standings, behind the Islamic Republic of Iran who top the table following their 5-0 win over Yemen a day earlier.

The 1996 runners-up were held to a 1-1 draw by Bahrain on Matchday One, a result which raised doubts as to the genuine title credentials of a side which also finished third at the last continental extravaganza in Australia.

However, goals in either half from Khalfan Mubarak and Ali Mabkhout saw the Emiratis overcome a resilient India to go top of Group A and breathe new life into their bid to reach the tournament’s Round of 16.