Sherwood says a loan spell at Leyton Orient was key to Kane's career.
He told The Sun: “Orient was an important part of Harry's development as a young player and I think he enjoyed it. I wanted him in a dressing room where people have bills, mortgages to pay, families to feed. It toughens them up.
“He went through all that because he wanted to play for Tottenham.
“Harry would never have done that. He only counts first-team appearances — he doesn't care about junior or under-21 appearances."