Former Celtic midfielder Stuart Armstrong is a free agent.
The 33-year-old was recently released by Sheffield Wednesday upon the expiry of his contract with the club.
Armstrong made just 11 appearances for Wednesday after joining them midway through the 2024/25 campaign.
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He only penned a short-term deal at Hillsborough and is now without a club going into the summer.
It remains to be seen where Armstrong may end up. He left Celtic following a trophy-laden few years, where he worked under current Parkhead manager Brendan Rodgers.
His Wednesday release was confirmed on Friday.
A club statement read: "The Owls can confirm our retained list following the conclusion of the 2024/25 season.
"Stuart Armstrong, Ben Hamer, Ryo Hatsuse, Michael Ihiekwe, Marvin Johnson, Pol Valentin and Mallik Wilks are released following the expiry of their current contracts.
"The Owls would like to thank all departing players for their services and we wish them the very best for the future."
Elsewhere, Celtic ultras have called on supporters to disregard "intimidation or castigation" as they prepare for a Trongate title party.
A statement read: "As another successful season draws to a close, we would like to thank the Celtic support for your continued backing. Your moral and financial support sustains the Celtic ultras scene, which we're particularly grateful for given cost of living challenges coupled with the crippling costs of following Celtic.
"This season, Bhoys Celtic celebrated its 10th season; meanwhile next season will be the Green Brigade's 20th season. For both groups, these respective milestones mark survival in an environment pitted against us and has only been possible because you have embraced what we do.
"Fundamentally, we exist to support and celebrate Celtic. We believe we add value to the overall Celtic experience, while accepting that our style is not favourable to all. Rooted in our existence is the belief that ALL fans deserve more from the game.
"Over recent months, we have liaised with ultras groups across Scotland in a bid to achieve a fairer deal for all fans. We have learned that while Celtic comfortably leads Scottish football on the park, off the park - in relation to fan engagement - Celtic trails the rest.
"A perfect example of this is the price increase to Season Tickets which ironically lost two matches in 2023. Another example is the restrictions on fan tifos - while cynically seeking to replace these with outsourced efforts. A final example is communications on any fan issue - which typically feed into a derogatory narrative on Celtic or football fans generally.
"The 'Trongate Title Party' is the most recent example of this. It is another example of police, authorities and football clubs disregarding the role and importance of fans. Despite several months notice, there was no will to engage with fans on this issue. There is no framework, culture nor will to engage with fans on any issue.
"As another long and expensive season draws to a close, we encourage fans to celebrate in a fashion they deem fit; irrespective of any intimidation or castigation from those who already look down on us."
