"The way we lost was the most disappointing thing, we had no fight in us today. They outplayed us and deserved to win the game," he said.
"We didn't create enough opportunities, didn't move the ball well and we didn't win enough one on one contests.
"In the end it came down to one error on a sideline free hit where we didn't cover properly. We'd spoken about it before but we weren't diligent enough about it and they scored an opportunist goal.
"It's disappointing but you've got to move on and we now need to get six or seven points from our final three pool games otherwise we're going to be in trouble."
The Black Sticks Women play their third pool game against the Netherlands in front of a sold out stadium of 15,000 on Thursday at 5.45am (NZ time).
The Black Sticks Men play South Africa in their second Pool B game on Wednesday at 12:30am (NZ time).
In other women's Pool A results today, Australia edged Japan 3-2 to remain unbeaten while the Netherlands go up against Belgium later in the day.