"Because if Spurs maintain just being a top four team, that will not be good enough for somebody like Harry Kane.
Harry Kane may leave Spurs to become world class says Phil Neville
Former Manchester United and Everton defender Phil Neville suggests that Harry Kane may have to leave Tottenham to realise his world class potential.
Kane scored two goals in a man-of-the-match display in Spurs' opening UEFA Champions League win over Borussia Dortmund at Wembley on Wednesday night.
Speaking to BBC Five Live, Neville said: "He could have to leave Spurs to become that real top, top, world-class Lewandowski type player.
"Because if Spurs maintain just being a top four team, that will not be good enough for somebody like Harry Kane.
"I think he needs to be challenging for Ballon d'Ors. I think he needs to be challenging for Champions Leagues and if Spurs are always going to be that 'nearly' team, eventually he will want to leave and join a Real Madrid or Barcelona."
Neville also feels Kane's situation is similar to Lewandowski's case when the Polish forward decided to leave Dortmund and join Bayern Munich in 2014.
"I think when he went to Bayern Munich and proved for one of the biggest clubs in world football, people started to then think 'Lewandowski is world class'.
"I was at Manchester United at the time when we were scouting players at Borussia Dortmund like Kagawa, like Reus, Lewandowski was there and there was always that doubt. And there'll always be a doubt, probably, about Harry Kane until he gets to that level."
Following his traditional August goal drought, Kane has found his scoring boots again netting six goals in his last eight appearances for club and country.