Experienced heads such as captain John O’Shea felt the wrath of Di Canio following his mistake that led to giving away a penalty and a red card in Sunderland’s 3-2 loss to Crystal Palace at the end of August.
Di Canio chose to publically criticise the former Manchester United defender, something Gray says he was wrong to do, the Daily Star report.
Michael Gray: “Publicly, he has criticised a few of his players but some things you keep in the dressing room.
“You criticise your players face-to-face. When you say things in front of the cameras, dressing rooms can become very strong.
“You look at the likes of Wes Brown and John O’Shea. They’re strong characters who have been fantastic in their careers.
“Paolo Di Canio is going to say what he thinks – he doesn’t hold back – and maybe he did lose the dressing room in the end.’’