Don't know about football terms, but in basic English law terms, my very limited understanding is:From Lilywhite Rose in youth thread.
Ps Posted last Monday in reply to the Dortmund story.
Mikey has already signed a pro contract with us until 30 June 2026. That will be officially announced when he turns 17 in early August. So Dortmund would have to agree a fee with Spurs rather than simply approaching the player.
A minor (under 18) can sign a contract.
However, any contract signed by a minor is voidable any time before their 18th birthday