The Republic of Ireland international wrote a foul-mouthed message after being left on the bench for Friday's World Cup qualifier against Kazakhstan and had described his omission from the team as a "joke". Despite deleting the message he still faced a backlash from his team-mates and manager Giovanni Trapattoni.
McClean has since issued an apology and deleted his account. However, club manager Martin O’Neill believes that the player still has a lot to learn.
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O'Neill told reporters: "James has been acting rather strangely. It's good when the player not only wants to play, but he also wants to manage the team as well.
"James is rather young for that at the moment. I think Mr Trapattoni has got a couple of years on him and a couple of titles, too, in front of James, so I think he's entitled to pick the team.
"He has even admitted himself he has been rather foolish. He has taken himself off Twitter, apparently then he might have a situation with Facebook as well and about 14 other accounts that he has.
"He has a bit of a problem and we will have to rectify it. We can have a bit of a joke about it and laugh about it and think: 'Well, that's okay'.
"He does know the rules - they were read to him, they were given to him, he was there that day - and not only that, some of his language was pretty poor and we will have to deal with that.
"Genuinely, we can have a laugh about it first of all but now it's getting a bit ridiculous."
The 60-year-old insists that footballers could have a positive impact off the pitch and pointed to the good work done by his players as evidence.
He continued: "I hate to use these words 'role models' because some players can do some great things outside the football club and it never gets recognised.
"These players here at Sunderland, actually, do as much as any players that I know at any football club, they do as much outside work as anybody.
"But this here is a situation where James has got a lot to really learn. He has got to temper everything and he has got to rein in, he really has to rein in. He has to show some responsibility now."