Knibbs was born and raised in Derbyshire and joined the Aston Villa academy as a child. He signed his first professional contract at the end of the 2016–17 season. In June 2019 Knibbs signed a two-year contract with Cambridge United. On debut for Cambridge Knibbs scored the winning penalty as Championship side Brentford were defeated in the EFL Cup.
Knibbs' brother is international athlete Alex Knibbs, who won a bronze medal in the 4x400m relay at the IAAF U20 World Championships. Knibbs’ dad, Ralph Knibbs is a former elite rugby union player for Bristol.
- "Notification of shirt numbers" (PDF). English Football League. Retrieved 15 October 2019.
- "H. Knibbs". Soccerway. Retrieved 29 August 2019.
- Dicken, Alex (21 July 2018). "Who is Harvey Knibbs? Profiling the striker in Villa's first team". Birmingham Mail. Retrieved 29 August 2019.
- Taylor, Mark (5 June 2019). "Former Aston Villa striker Harvey Knibbs tipped to bring power to Cambridge United strikeforce". Cambridge Independent. Retrieved 14 August 2019.
- "Brentford 1–1 Cambridge United". BBC Sport. 13 August 2019. Retrieved 29 August 2019.
- Harvey Knibbs at Soccerbase
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