Harmanpreet and midfielder Harjeet have spent considerable amount of time under Oltmans last year when the senior men's team prepared for Rio Olympics.
While both Harmanpreet and Harjeet played at the FIH Champions Trophy in London last year where the team won an historic Silver medal, Harmanpreet went on to represent the country at the Olympics.
The two youngsters along with nine others from the junior team are part of the 33-member core probables being put under the grind at the Senior Men's national camp here in SAI.
"This is a practice we followed even during the camp ahead of Rio Olympics. I got to work a lot with experts Raghunath and Rupinder. In this camp too, dragflickers go an hour early and try out different variations," said Harmanpreet.
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With Raghunath being excluded from the camp, Harmanpreet is expected to shoulder the responsibilities of a defender-dragflicker, a role he is ready to take on.
"We also have several meetings with just the players and we discuss our goals, where we need to improve. We also discuss any difficulties we face. I think these aspects are very important especially for juniors in the squad."
Harmanpreet and Harjeet were instrumental in the junior team's successful campaign at the 2016 Junior World Cup.
Midfielder Harjeet, who captained the junior squad, said: "The expectations are higher in the senior camp. We cannot make small mistakes in basic skills and get away with it. We are expected to show maturity and responsibility on the pitch in every session at the camp."
"It's only been two weeks since we started the camp and there are times when the new comers find certain sessions to be tough. But the Coaches keep asking us about the difference between junior and senior level of training," Harjeet said.
"They motivate us and tell us that it's ok to find it tough. They tell us it's only a matter of time before we get used to this level of training and encourage us to keep talking to them or the seniors if we have any issues."
In a recently held awards ceremony, the Junior Men's Team was awarded the Best Team of the Year 2016 and were chosen ahead of the men's cricket team for the award.
"I think this was the first time that hockey was chosen over cricket and it is a very big motivating factor for us. These awards make us realize that if we work harder and show better results, the support we get will only increase.