He was part of the Asian Football Confederation Project Future referees program and visited the Premier League in England in 2010 with the AFC.

[4] In November 2016, Gillett was approached by ASEAN Football Federation to officiate in the 2016 AFF Championship first leg of the semi-finals match between Indonesia and Vietnam in Bogor.

[citation needed] In April 2017, he was appointed as one of the inaugural video assistant referees (VARs) in the A-League (the first top-tier football league in the world to implement the technology).

[citation needed] Gillett joined Select Group 2 in England at the start of the 2019–20 season after taking up a post-doctoral research position at Liverpool John Moores University.

[citation needed] Gillett also took charge of the second leg of the 2020–21 EFL Championship play-off semi-final between Brentford and AFC Bournemouth.