Second-year scholar Harvey operates as a central defender.
He first started playing football as a four-year-old in Spain where he grew up and is fluent in Spanish.
Harvey moved back to England when he was 14 and joined the Cherries academy.
He played a leading role as the Cherries reached the quarter-final of the FA Youth Cup in 2018/19.
Harvey is the younger brother of England and Southampton player Ryan Bertrand, who once had a loan spell with the Cherries.