The Iranian team lost to Al Muharraq in Group A in Tehran’s Shahr-e Qods Stadium.
“This result is not normal or fair. We had 70 percent of possession. We created many chances. Maybe they weren't great chances but at least we shouldn't lose the game. It was a good game and we deserved more than this,” said Sapinto.
“We had worked on the defensive weaknesses during the week but we conceded again. Small mistakes punish a team. The players played well and the least we should have done was not lose,” the Portuguese added.
Esteghlal next faces Jordanian side Al Wehdat, who is also searching for the first win, while Al Muharraq hosts Al Wasl.