However, despite being just 21, Friedel has insisted that Kane, who scored a hat-trick during Tottenham's 5-1 Europa League win over Asteras Tripolis last night, is "one of the best that [he's] ever played with".
"Harry Kane is the best finisher at the club - I've got no problem saying that. He's up there just with his finishing as one of the best that I've ever played with. He's got every type of finish - the power, the side-foot, he can chip and he can score from distance," said the American keeper.
"He's really got the eye for a goal. There is a very bright future ahead of him. On top of all that, he has a very good work ethic.
"[Getting carried away] is what this country likes to do about young players. There is no reason to get carried away with [Kane]. We just need to let him continue because he's developing at a very good rate. I'm sure the Tottenham supporters are going to see a lot of goals coming from him in the future."
England Under-21 international Kane has found the net on six occasions in all competitions this term.
Brad Friedel was speaking as he took part in the City Index Celebrity Traders Challenge. His page can be viewed here