Field began his career with spells in the youth systems at non-league clubs Kingstonian and Leatherhead and then joined the academy at Brentford at age 15. He was a part of the Bees' U15 team which won the Junior category in the 2012 Milk Cup. Field progressed to sign scholarship forms at the end of the 2012–13 season and made 45 appearances and scored two goals for the youth team over the following two seasons. Moving from the wing to left back, he made his Development Squad debut while an U17 and signed a one-year Development Squad contract at the end of the 2014–15 season. Field signed a new 18-month contract in November 2015 and made his first team debut with a start in a 3–0 victory over West London rivalsFulham on 30 April 2016. He assistedScott Hogan for one of the goals from a corner, but was forced off after 53 minutes with a calf injury.
Field was promoted into the first team group during the 2016–17pre-season and the departure of long-term left back Jake Bidwell on 1 July 2016 meant that he became the only available left back, which allowed him to play the full 90 minutes in friendlies versus Vfl Bochum and Wycombe Wanderers. Field made his first competitive appearance of the season versus Exeter City in the EFL Cup first round on 9 August 2016 and played the full 120 minutes of the extra time defeat, but he could not break into the league lineup due to the arrival of loan left back Callum Elder. After a period out with an injured groin, he made his first league appearance of the season as a second-half substitute for Yoann Barbet during a 2–1 victory over Burton Albion on 10 December. After two further starts, Field signed a three-and-a-half year first team contract on 23 December. He scored the first senior goals of his career with a brace in a 5–1 FA Cup third round victory over Eastleigh on 7 January 2017. Field lost his place to fit-again Rico Henry in February and finished the 2016–17 season with 17 appearances and three goals.
Out of favour (2017–2020)
With ample cover for Rico Henry at full back, Field departed on loan for the first half of the 2017–18 season and returned to Griffin Park on 1 January 2018. His only call into the first team squad came on the final day of the season, when he was an unused substitute during a 1–1 draw with Hull City. After two EFL Cup appearances in August 2018, Field departed on loan until January 2019. After his return, injuries to full backs Henrik Dalsgaard and Rico Henry saw Field made his final appearance of the season as a substitute for stand-in right back Sergi Canós after 83 minutes of a 1–0 win over Aston Villa on 13 February 2019. Having failed to win a call into a matchday squad so far during the 2019–20 season, Field was made available for transfer in January 2020. He departed the club on the final day of the January 2020 transfer window and ended his time at Griffin Park with 21 appearances and three goals.
On 7 August 2017, Field joined League One club Bradford City on loan until 1 January 2018, as cover for the injured Adam Chicksen. He made his debut the following night and played the opening 76 minutes of the Bantams' 3–2 EFL Cup first round defeat to Doncaster Rovers, before being substituted for Paul Taylor after 76 minutes. Field made four further appearances before dropping to the bench in mid-September after Chicksen returned to fitness. Despite Chicksen suffering a long-term injury in mid-October, Field made just three further appearances before returning to Brentford when his loan expired. He made 8 appearances during his spell.
On 31 August 2018, Field joined League Two club Cheltenham Town on loan until 1 January 2019. In an injury-affected spell, he made just 11 appearances before his loan expired.
On 31 January 2020, Field joined Scottish Championship club Dundee on a contract running until the end of the 2019–20 season. Field made his only appearance for the club as a substitute for Declan McDaid after 75 minutes of a 0–0 draw with Ayr United on 7 March 2020. As a result of the COVID-19 pandemic leading to the suspension and cancellation of the season, Field's contract was extended to 1 July, after which he was released.
