In 2017, Mitchell-Nelson signed for Southend United from Essex Olympian League club Ryan. On 24 April 2019, Mitchell-Nelson was named on the bench in a 3–0 away win against Oldham Athletic.[3] During the first half of the 2019–20 Isthmian League season, Mitchell-Nelson was loaned to Harlow Town, before being recalled by Southend in January 2020.[4] On 1 February 2020, Mitchell-Nelson made his debut for Southend in a 2–1 victory against Lincoln City.[5]
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