The 17 year-old midfielder has shone for the U18 team so far this season, while also turning out for the U21s in the National Cup.
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Thwaites began training with his senior teammates on Friday and is now part of Amorim's squad, says The Sun.
Boasting a good passing range, Thwaites is regarded as a long-term central midfielder.
Amorim and his coaching staff have been especially impressed by Thwaites in training with his older colleagues and believe he deserves an extended change working with the senior setup.