India had to field a depleted side without four starting XI Players including "talismanic" skipper Sunil Chhetri at the Azadi Stadium last night.
"They controlled the game. It was a very difficult game for us even before it kicked-off. In the first half, we conceded from a penalty and had two Players coming out for injury. It made it all the more difficult for us," Constantine said at the post-match Media interaction.
"We tried to contain Iran and paid the price for some mistakes. We were short in some areas and paid the price for that. Iran are one of the Best Teams in Asia and playing at the Azadi Stadium has its own challenges."
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"I was very much surprised by Team India's display. There has been a vast improvement in their performance over the last few months," he said.
On the field, India conceded two goals through penalties and were forced to make two substitutions in the first half itself.
The two penalties were converted by captain Ehsan Haji (33rd and 66th); and one each from Sardar Azmoun (61st) and Alireza Jahan (78th) settled it for Team Melli. Iran led one-nil at the half time.