United signed Cameron from Liverpool for an undisclosed fee on a three-and-a-half-year deal on 11 January 2018. The midfielder had been at Anfield since the age of five and made three senior appearances for the Reds, as well as representing England at both U18 and U20 levels. 

He had a loan spell at Fleetwood Town in 2016/17, helping them to the League One play-offs. Cameron won the Players’ Player of the Year award for 2018/19 and at the end of the 2020/21 season signed a new contract to keep him with the U’s until 2023.

Cam then signed a new long-term contract with the club in the summer of 2024 following the Club getting promoted back into the Championship for the first time in 25 years.

The 29-year-old has played 338 times for United and was appointed Club captain in the summer of 2025 following Elliot Moore's departure.

Brannagan has also scored 59 times for United.