The departing Ajax boss also has kind words for Daley Blind of Manchester United.
Ibrox side Rangers want to sign Burnley midfielder Joey Barton in the summer transfer window.
Martin O'Neill, Roy Keane and Paul Lambert got his vote.
Tottenham Hotspur midfielder Mousa Dembele and Chelsea star Eden Hazard are Belgium international teammates.
Ibrox side Rangers and Hibernian will face each other in the final of the Scottish Cup on Saturday.
The Black Cats have been through three more managers ever since O'Neill's departure.
The Werder Bremen defender reportedly wants a Bundesliga stay.
Gary Megson claims the owls were built on free transfers and loans.
The 20-year-old only recently signed with Las Palmas.
The Romanian side believe Celtic are the easiest tie they could get.