The former Derry City winger has been fined by his club after finding himself embroiled in a row on Twitter over his musical tastes, according to reports
The 23-year-old Republic of Ireland international was recently criticised by a unionist Member of Parliament (MP), the Democratic Unionist Party (DUP) politician Gregory Campbell, after posting a tweet expressing his enjoyment of the Irish folk band The Wolfe Tones and the song "Broad Black Brimmer".
The former Derry City player's endorsement of the song, which is about the events surrounding the Irish War of Independence and the Irish Civil War in the early 20th century, led to the MP accusing the player of promoting terrorism.
Sunderland manager Martin O'Neill had previously warned McClean against using the social media platform after he received death threats, but the winger opted to continue posting messages, against the advice of the club. He has since removed his account.
According to the Daily Telegraph, McClean's recent behaviour may eventually lead to his exit from the Stadium of Light as his frequent forays on Twitter have been a source of unease at the Stadium of Light, with the player's team-mates becoming annoyed with his attitude in training, as well as online.