Iran are heavily tipped to secure a 10th Asian title and did little to discredit those claims by storming into the last eight with three wins from three.
The Iranians – ranked fifth in the world – are the tournament's top scorers with a stunning 35 goals and have conceded just five, but regardless of those impressive statistics, Shams had not been happy with the performance of his side in the first two games.
The Iranian coach was finally smiling after their final Group B game against Kuwait, however, as his side romped to a comfortable 7-0 victory and he believes there is more to come from his side.
“I do not think that this (performance against Kuwait) is our limit. We can expect more,” he said.
Despite Iran’s emphatic form in Tashkent, Shams, who was part of the coaching team that helped Iranian side Foolad Mahan Sepahan claim the inaugural AFC Futsal Club Championship title in March, is refusing to underestimate a Lebanon side he feels is improving considerably.
"I have followed the Lebanese team and over the past two years they have grown in just an unimaginable way.
"Those who believe it will be easy against Lebanon are very much mistaken."
Lebanon coach Dory Zakhour is under know illusions as to the difficulty of the task his side faces as they look to cause an upset by beating Iran.
The Lebanese are bidding for revenge after they lost to Iran at the same stage of the AFC Futsal Championship two years ago, suffering a 9-1 defeat.
Not only did Iran not lose a game on the road to the final of that tournament but they also conceded just three goals throughout.
And though they odds may seem stacked against his side, Zakhour promised that his players will not hide from the task at hand.
"Probably everyone thinks that this is the most predictable quarter-final," he said. "Indeed, we are playing against the top team in the continent, but nevertheless it does not mean that we are ready to surrender without a fight.
"The fact are that it will be hard, no doubt, but we will fight till the last."