Kane took his worldwide tally to 10 goals since debuting in 2015 after scoring twice as England eventually eased past Malta 4-0 in World Cup qualifying on Friday.
For the record Kane is 24 years and 38 days old and has scored 125 career goals.
Kane has also hit the net 10 times in 20 outings for the Three Lions and although both Ronaldo and Messi had more than double that for their respective countries by age 25, Southgate is not discounting Kane from going down as one of football's best ever forwards.
If England prevail against Slovakia they will need just two points from their last two games to secure automatic qualification and Southgate says the firepower in his squad gives him plenty of options. "He knew this morning how many goals in games he had, and also how many Ronaldo and Messi had at this point". Ronaldo remains one of the world's best players and the face of arguably the world's best team―selling him now would be bad business by Los Blancos.
"I have every trust in Harry", Southgate said.
There is certainly a high chance that Kane could go on to break Rooney's, record especially considering that he is young and is bound to get better as he reaches the peak of his career. "I've worked with him long enough, from the U21s through, and he'll deliver whatever the occasion", he added. You've got to have that drive and belief, and that's what he's got.
Real offered Gareth Bale instead but the 29-year-old Welsh worldwide refused to move, preferring one more season at the Bernabeu before returning to English football. What's the rationale?' I never minded that self-belief.