The 21-year-old, spent the first half of the season on loan with Mansfield.
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Oxford boss Matt Bloomfield said: "At every level he's played, he's stepped up and shown maturity, authority and a real understanding of the game that goes beyond his age.
"He has excellent quality in midfield, a strong work ethic and a real desire to improve.
"He's already gained valuable experience and we believe he has a very big future here."