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Sheffield Wednesday are a professional football club based in Sheffield, England, playing home matches at Hillsborough Stadium. Barry Bannan is an experienced Scottish midfielder who previously spent many years at the club and is closely associated with its recent history, having captained the side in the past. Millwall are a separate English football club, based in south London, that Bannan had more recently been playing for.

A player "returning" to a club generally means they have signed again after a spell away, often viewed by supporters as significant when the player was a long-serving or popular figure. Transfers like this are typically confirmed through official statements from the clubs involved, covering details such as contract length and any transfer fee.