Indian hockey has been going through turbulent times with Paul van Ass becoming the fourth foreign coach in recent times to be unceremoniously sacked following differences with the national federation.
Sardar admitted that the rhythm of the team is affected by such changes.
"When a coach is replaced, the players face difficulty. The team's strategy also changes with the change in coach and it takes time in building the side. But we are positive about the Olympics and the upcoming tours," said Sardar Singh ahead of the team's departure for the tour of Europe.
"We had a good training session. Players also worked hard in different areas including basic physical exercise, technical skills, defending and attacking part of hockey," said Oltmans.
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Asked about the ups and downs that the team has been through, the coach said, "Yes there are ups and downs but we are improving those areas."
"We are focusing on the attitude of how to win the games, how to create goal scoring opportunity, as only playing is not important," said the Indian coach.
"Our defending, attacking, penalty corners and much important is the coordination among players. It needs improvement but our players are physically and mentally fit so they can improve," he added.
Admitting that he is in line of fire after taking over as coach, Oltmans said despite the pressure, he is "very stable".