The defeat left PSV two points clear of Ajax having played a game more, and continues a bad run of form for the leaders.
“Heerenveen were very good in the first half and put us under pressure,” Advocaat told reporters.
“But it is unbelievable to see how we gave away those goals today. It’s not the first time that’s happened.”
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Since Guus Hiddink arrived at the helm, Chelsea have improved considerably after a tricky start to the campaign.
Newcastle United are staring down the barrel of relegation to the Championship for the second time in the past eight years.