Liverpool great Graeme Souness can see Harry Kane leaving if Tottenham fail to finish in the top four this season.
Souness believes the England striker would "walk into" the Real Madrid or Barcelona team but warns the "window of opportunity to do so while in his prime is not big".
Souness told The Times: "If they fail to do so (reach top four) or if they fail to pick up silverware, ie beat Manchester City in the Carabao Cup final next month, then Kane should be having a word with his agent about new employment.
"Even if they beat City, he might still want to think about leaving. He turns 28 in the summer, and time is running out for Spurs to deliver collectively on what his individual efforts deserve. And those individual efforts have been world class.
"Unlike some in the punditry profession, great is not a term I confer lightly on footballers but Kane has the right to be called that.
"Barcelona, Bayern Munich, Real Madrid, Manchester City — he would walk into the starting line-up of any of those teams. The window of opportunity to do so while in his prime is not big."
