He became the youngest player to appear for the Eagles when he made is first team debut as a second-half substitute against Watford in October 2007.
Bostock turned 16 in January and so is free to negotiate a professional contract, but the two London clubs have yet to agree a fee for the �5m-rated playmaker.
Meanwhile, Tottenham's skills coach Ricardo Moniz has left the club after three seasons at White Hart Lane.
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