All but through to the quarterfinals, India were made to work hard to register a fighting 2-1 win over South Africa in their final Pool D match and keep their unbeaten run intact in the 16-nation tournament.
Harendra was critical about his wards' performance today.
"Nothing was missing but we just did not play simple hockey today. But the good thing is that it has happened before the knockout stages," he said.
The coach, however, was satisfied with the fact that they could pulled off a win.
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"We missed a couple of chances but if we look at the possession of the ball, circle penetrations I think we were superior. We have to work on a few areas, but overall I feel we played well. But I am happy that we could sustain the momentum," Harendra said.
"My glass is always half full. The first 15 minutes we played very well and after that the energy level went a bit down but still we created a couple of number of opportunities. The little link was missing today but it is part of sports which happens with every team.
"Looking at the number of circle penetrations and possession of the ball we deserved to win but we could have done a little bit better. We know we have to be better in the next round, there is no doubt," Oltmans said.
The Dutchman called the Indian colts to use their brains a bit more and stick to their game plan instead of trying too many things.
"The most important thing is to stick to our game plan and to be honest I feel we did not do that enough today. But that's a lesson for the next match.
Oltmans said going into the knockout stage, the hosts can't afford to be complacent at any point of time.
"We made it clear to them (players) not to take the game lightly. We prepared ourselves very well for this game. After the first goal it became a bit sloppy and there was less energy and that was the disappointment for me," he said.
"We started off well and were playing simple hockey but after scoring the goal we all started to play individual hockey, no one was passing the ball and so we faced problems," he said.
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