 On 26 November 2015, Maguire signed a two-month loan deal with Oxford United.He made six League appearances, played in a notable victory over Premier League side Swansea City in the third round of the FA Cup, and scored against Yeovil Town in the area semi-finals of the Football League Trophy.On 1 February 2016, Maguire's contract with Rotherham was terminated by mutual agreement, and on the same day he signed a contract with Oxford until the end of the 2015–16 season.