Kane is one of the best young strikers in Europe, but he struggled to play well for England at the 2016 European Championship in France this summer.
The 22-year-old failed to score a single goal in four matches for England, creating six chances in the process.
Former Liverpool striker Collymore has suggested that playing regular non-stop first-team football for the past 18 months has taken its toll on Kane.
“Individual disappointments include Joe Hart who must be under real pressure for his Man City starting place, Harry Kane who looked like a young man who’s rise and too much football over the last 18 months has broken him a little,” Collymore wrote on Boylesports.com while analysing some big-name players’ performances at the 2016 European Championship in France.
Kane scored 25 goals and created 44 chances in 38 Premier League appearances for Tottenham last season.
During the 2014-15 campaign, the England international striker scored 21 goals and created 27 chances in league matches for Spurs.
The youngster did struggle for the Three Lions in France, but he remains one of the best strikers in the Premier League.
Tottenham fans should be optimistic about Kane banging in the goals regularly next season.
Spurs, who will play in the Champions League next season, will be aiming to win the Premier League title during the 2016-17 campaign.