From Wikipedia: Doak began his career at hometown club Dalry Rovers, before moving to Ayr United and then onto Celtic. On 26 December 2021, Doak, having turned 16 the previous month, was named on the bench for Celtic’s 3–1 win away to St Johnstone. On 29 January 2022, Doak made his Celtic debut, coming on as a 68th minute substitute in a 1–0 Scottish Premiership win against Dundee United.
Doak signed with Liverpool in March 2022, with Celtic due to receive training compensation of around £600,000. On 9 November 2022, Doak made his debut for Liverpool when he came on as a 74th minute substitute in a 3–2 penalty shoot-out win against Derby County in the third round of the 2022–23 EFL Cup at Anfield. Five days later, Doak signed his first professional contract with Liverpool, having reached the age of 17.