The 15-year-old, who has been with the club for three years, will join up with their Under-18s on a full time basis for an initial two years when he finishes his school education in July.
David Horseman, who leads youth development at Ashton Gate, told the club's official website: "Tom is a clever central midfield player who is very good on the ball and makes smart decisions in tight situations.
"Tom has showed excellent mental strength after a couple of operations and really earned his contract.
"He is a player who will only get better as he grows and works with specialist staff in the PDP (player development programme)."
- Sports & Recreation