From UNISON's website.
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Length of suspension: Your employer needs to do what they can to resolve the issue swiftly and keep the suspension to a minimum. Your employer should keep the suspension decision under review.
That's the legal angle. Johnson claimed innocence, the club sought independant legal advice as well as working with outside agencies regarding safeguarding, and of course the PFA were involved as well.
The employers hands were tied in relation to resolving the issue as swiftly as possible due it being a criminal investigation rather than a simple in-house issue. The review would have occurred after all relevant discussions between all parties had taken place and then it would have been decided the suspension would be lifted as legally, that's pretty much what they had to do.