[3] Oxlade-Chamberlain made his professional debut on 1 September 2015, coming on as a substitute for Adam McGurk in a 0–2 Football League Trophy away defeat against Exeter City.
[5] On 25 April 2016, Oxlade-Chamberlain was offered a one-year professional contract with academy manager Mark Kelly stating "Christian's a bit of a late developer, as he's younger than the rest of the lads in that age group.
[9] Later that season, he had two loan spells at Oxford City in the same league, both being curtailed by injury crises at his parent club, though he did not make any further appearances for them.
[10] On 18 July 2018, Oxlade-Chamberlain completed a transfer to League Two club Notts County, signing a two-year contract, with effect from 1 August.
[11][12] He made his debut on 4 September in an EFL Trophy 2–1 loss at Grimsby Town, playing the full 90 minutes in Harry Kewell's first match as manager.