The 28-year-old leaves the Jambos after making 176 appearances in maroon, scoring eight times.
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Devlin was part of a Hearts squad that were beaten to the Scottish Premiership title by Celtic on the final day of the 2025/26 league season at Parkhead, but will not be making his return to Tynecastle Park next season to try and build upon a strong campaign.
The Aussie has been linked to Rangers to re-join his old Hearts boss Derek McInnes as a free agent, and has reportedly also had contract offers from the MLS.