Van Marwijk says Newcastle target Erik Pieters "doesn't realise how good he is"
Newcastle United boss Alan Pardew remains keen on the defender, who will miss the summer tournament with a foot injury.
"I think for the Netherlands Erik has done very well," said Van Marwijk. "He actually keeps getting better and better. If he'd been fit, he would've been my first-choice left-back.
"I think Erik doesn't realise how good he is. With him, its always been a mental thing."