On 23 September 2016, Roland-Jones took a hat-trick against Yorkshire to secure the County Championship for Middlesex for the first time in 23 years.

[3] In September 2017, Roland-Jones suffered a lower-back stress fracture whilst playing for Middlesex and was consequently unavailable for selection for the England winter tours to Australia and New Zealand.

On his return to county cricket in April 2018, a recurrence of the injury was predicted to rule him out of the 2018 season.

[4] On 26 July 2019, in the 2019 t20 Blast match against Glamorgan, Roland-Jones took a hat-trick,[5] finishing with career-best figures of 5 for 21.

[8] He made his Test debut for England against South Africa on 27 July 2017[9] and took five wickets in his first Test match, ripping through the South African top four and completing his maiden five-for by removing Temba Bavuma.