[1] Doohan began his career with Celtic, spending time on loan with Cumbernauld Colts in October 2015,[2] where he made 4 appearances in all competitions.
[6] After signing a new four-year contract with Celtic, he moved on loan to Ayr United in July 2018,[7] making his senior debut on 14 July 2018 in a Scottish League Cup game against former club Greenock Morton.
[13] He then joined Dundee United on an emergency loan in April 2021 following an injury to their first choice goalkeeper, Benjamin Siegrist.
[22] Selected for the under-21 squad in the 2018 Toulon Tournament,[23] he played as the team lost to Turkey in a penalty shoot-out for third-place.
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