 He was an unused substitute for the Chelsea first-team at the age of 15, in their League Cup clash against Newcastle and travelled with them to the 2012 UEFA Champions League Final at the Allianz Arena, which Chelsea won.On 30 August 2013, Chalobah signed a new five-year contract with Chelsea, stating that he wished to stay at Chelsea for his entire career.Chalobah signed on loan for Championship club Watford on 31 August 2012 until January 2013.