Ryan Mullen, born on 18 May 2001 (age 25), is a Scottish goalkeeper whose senior career has been shaped far more by Greenock Morton than by his early brush with Celtic.
He joined Celtic from Cove Rangers in October 2020, but his time in Glasgow came before the main part of his career took form. In September 2022 he moved on to Clyde, where he made three league appearances in the 2022-23 season.
Morton then became the substantial spell. Across two seasons at Cappielow, Mullen made 47 league appearances, giving him the run of senior football that had not arrived earlier. It is the part of his career that carries the most weight, rather than the developmental years around it.
He is now with St Mirren. In 2025-26, he has made two league appearances and one in the Scottish Cup, bringing him to three appearances in all competitions for the club.