Loan to St Johnstone
On July 28, 2022, Matthews was loaned out from Crystal Palace to St Johnstone for the entirety of the 2022–2023 season. This loan spell was to provide Matthews with the opportunity to gain regular first-team football, ensuring he maintained his competitive edge and goalkeeping sharpness. At St Johnstone, Matthews took on a pivotal role as a starter, offering experience and stability to the Scottish Premiership club.
