Sundram's pain over short Suzuki Cup stay
Chasing a win to give themselves the best chance of progressing to the last four, the Lions took the lead through a fine first-half strike from Khairul Amri.
Indonesia hit back after the break however with goals from Andik Vermansyah and Stefano Lilipaly to take the three points and the second spot behind group winners Thailand.
The boys were fighting until the last minute. On our day we could have beaten Indonesia
“Obviously, it hurts,” Sundram said. “We took the lead and we were confident that we could keep it, but from two crosses the marking in the box was lacking and we conceded the goal.
“We had enough chances to score but we didn't take them.”
Indonesia's first goal was an obvious turning point as Andik arrived unmarked late in the box to volley past the helpless Hassan Sunny.
“We were coping well until the cross and the late run. We can defend as a unit and could have preserved the lead.”
Despite the fact that Singapore collected just one point from the tournament, the coach insisted that he was happy with the performances from his team.
“Overall the boys have done well and were fighting until the last minute," Sundram added. “On our day we could have beaten Indonesia.”
Sundramoorthy, appointed on a one-year contract in May, refused to answer questions on his future, asking the reporter: “How long have you been in your job? After six months did people judge your future?”