Murphy reckons playmaker Van der Vaart, 28, is a class apart.
"Liverpool played them in a pre-season tournament, I think it was, and he was top drawer.
"I think the one special thing for a player in that position, is that his end product is really good. I think he scores goals and makes goals.
"Sometimes if you play as that second striker you can be a bit of a luxury and he certainly isn't that. He's very calm in front of goal.
"He knows when to shoot and when to pass. He's got that extra second in the box, which top players seem to have.
"He's been a brilliant addition considering they only paid, what, £8million for him?"