Seven Black Cats players have appealed after the Italian manager docked two weeks' worth of wages for indiscipline, a move that has been criticised by PFA chief Gordan Taylor
Phil Bardsley is one of those appealing after after a picture was posted on Twitter of the defender lying on the floor of a casino covered in cash and believes his actions are not in breach club rules.
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"He cannot be a law unto himself," Professional Footballers' Association chief Gordon Taylor told reporters.
"We’re aware of player unrest at some comments made publicly, and other situations. A number of players are involved.
"We’re aware of Paolo Di Canio’s comments - it’s something we had to deal with [when the Italian was manager] at Swindon as well.
"Our rules for discipline are agreed with the Premier League and Football Association."