He made 12 appearances in his first season and is now hoping to challenge Angelo Ogbonna and Winston Reid for a spot in the first team.
How does he play?
Having debuted in midfield, Oxford is clearly more of a ball-player than the traditional centre-half.
Tall but relatively slight, his pace is what he generally uses to neutralise opponents, while his calm demeanour stops him from diving into challenges.
His style and the fact he has come through the West Ham academy have seen him compared to Rio Ferdinand and it's easy to see why.
Harry Redknapp called Ferdinand 'a Rolls Royce defender' and Oxford's easy movement across the field is similar.
However, Sir Alex Ferguson reckoned his United defender was 'a casual sod' and the youngster doesn't come across with the same laissez-faire attitude despite exuding calmness.
What do they say about him?
West Ham manager Slaven Bilic: "He's definitely going to be a big player.
"He's only 16 so he's going to have ups and downs, but for now we have to manage him – not only on the pitch but off it too so he stays grounded and can progress.
"The boy has everything, everything."
Former Arsenal, Man City and Arsenal striker Niall Quinn, after Oxford's league debut: "To say a star is born it’s absolutely true.
"The kid’s not only broken some phenomenal records and played the game, he was outstanding.
“I kept a real close eye on him, sometimes off the ball he’d turn around and give out instructions, pointing fingers, letting things develop.
“He had a maturity today which was so hard to understand because you think he’s going to be lost out there and that all the others players are going to have to rally round him and it was the exact opposite.”
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