 On 15 October 2016, on his second league appearance for Chelsea, Chalobah provided a back-heel pass to play Victor Moses through for the third goal in a 3–0 victory over Leicester City.On 13 July 2017, Chalobah signed for Premier League club Watford on a five-year contract for an undisclosed fee.On 26 September 2017, Chalobah was reported to have suffered a knee injury in a training session and was expected to have surgery.