Many including the coach were frustrated with the game team India played.
All three Malaysian goals came from penalty corner conversions. India have only themselves to blame for this defeat.
The qualification for the World Cup in 2018 is a bit complicated - with continental events like the Asia Cup in Bangladesh later this year also guaranteeing qualification for the champions - but a fifth-place finish in London will seal a spot for the tournament in Bhubaneswar next year. Malaysia keeper Subramiam came up with a brilliant save to deny Akashdeep Singh when he was set up by Chinglensana for a goal.
For India, it is their second defeat against Malaysia in little less than two months, having lost 0-1 to them at the Azlan Shah Cup last month.
Malaysia once against proved to be a thorn in India's flesh.
New Delhi, Jun 21 Striker Rani Rampal will lead an 18-member Indian women's team at the Hockey World League Semi-Final to begin on July 8 in johannesburg. The first quarter ended goalless with Malaysia controlling the proceedings. The idea was to pass the ball around quickly, not allowing the Malaysians to settle.More news: Scalise remains in critical condition after shooting
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In the match against India held at Lee Valley Hockey and Tennis Centre, Malaysia took the lead through penalty corner specialist, Muhammad Razie Abdul Rahim in the 19th minute before forward Tengku Ahmad Tajuddin Tengku Abdul Jalil doubled the advantage, a minute later.
The two teams couldn't make much progress in the third quarter.
Meanwhile, in other matches of the day, Canada and China will lock horns in 5th-8th classification match while Argentina will play Malaysia in the first semi-final followed by the second last-four clash between hosts England and Netherlands.
Another area which would be high on Oltmans' mind is the unimpressive performance of young Harmanpreet Singh from penalty corners.
Ramandeep (24th minute) brought India back into the game when he exploited some poor marking by the Malaysian defenders to deflect in a cross from Sumit.