Advocaat worked with Strootman at PSV Eindhoven.
"Strootman is a pure professional," the Dutch coach told Algemeen Dagblad.
"It frankly surprised me that he did not get to the absolute top last summer and was on the side a little. I do not think he will stay at Roma that long. If Kevin is at this level, he will be plucked away.
"And then it will be a team of the calibre of Manchester United."
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