Redknapp, speaking with The Sun, is sure to upset Spurs chairman Daniel Levy with comments this week.
He said of City: "The defence is not so solid and the guy who could put that right at a stroke is Jan Vertonghen.
"The way he brings the ball out of defence makes him perfect for City. He would probably cost around £40m but an all-Belgian central defensive duo of Vertonghen and Vincent Kompany could prove priceless."
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