[2] Whitcombe first played rugby union at 5 years old for Skipton RFC, in north Yorkshire,[3] and also played rugby league for Keighley Albion,[4] before concentrating on union at Bradford & Bingley RFC and Woodhouse Grove School where he was selected for England's under-16, England under-18 on their 2018 summer tour of South Africa and England under-19 sides.
[3] He joined Leicester Tigers academy's development pathway at the age of 13.
[6][7] After finishing school he spent 3 months playing for Sydney University Colts in the Shute Shield.
[8][9] In July 2019 Whitcombe was promoted to Leicester's development squad and became a full time rugby player.
[13] Whitcombe made his senior Leicester Tigers debut on 19 December 2020 in a European Rugby Challenge Cup win against Bayonne,[14][15][16] and made his Premiership Rugby debut as a replacement in a loss against Bristol Bears at Ashton Gate on 27 February 2021.