Fonterra's food safety officials had already started the investigation.
"It's horrible these things happen," he said.
"There is a lot of anxiety around it. It depends on how the recall is managed and how we get to a stable position.
"I have a feeling we will land in a good space ... our key customers are confirming in writing they are very pleased with the way we did it. They are all making statements."
But Fonterra's first priority was to stabilise the situation.
Yesterday Spierings personally apologised to a leading Chinese minister in charge of food safety in Beijing. He would also explain that he understood the anxiety in Beijing about the food safety problem and the facts of the situation.
He is also expected to personally apologise to the New Zealand public when he returns home, possibly as early as today.
"I still do believe we will manage our reputation back to where it should be."
Six of the eight Fonterra customers who had bought the affected whey protein product were fine and no food safety issues had been reported.
He said that a full report had been presented to Chinese authorities through the embassy.