Sunderland lost 2-0 to QPR on Tuesday evening and O'Shea was taking no prisoners with his comments after the match.
The Republic of Ireland international stated that the visitors simply wanted to win the match more in the early stages, and that opens up a lot of questions about the squad.
“We have to really understand that in the Premier League, you can’t start a game in first gear and give a team the encouragement we gave them,” he said. “No matter what position they’re in.
“I don’t think we’ve ever started a game like that. It was just poor play from us, QPR wanted it more than us early on. The Premier League is unforgiving, and no matter who you’re playing, you can’t afford to start a game like that at home."
The R's win was their first away victory of the season, but O'Shea's frank interview is particularly concerning because it shows how deep the problems lie at the club.
There are two ways to analyse the quotes from the former Manchester United man, and the first would be to place the blame on Gus Poyet.
As manager it is his job to motivate the Sunderland players and it seems rather surprising that they were outfought in a game of such magnitude.
Sunderland are fighting against the drop this season and a three-point haul against QPR, which they were expected to pick up, would have aided their survival chances considerably.
However, Poyet's defenders will argue that the players should have been able to raise their standards themselves for a match of such importance.
If Sunderland's squad cared deeply about the club's fortunes, then their mentality should not have been so laissez-faire and Poyet could have done little to change that.
Indeed, if the root cause of this demise is a lack of desire in the squad, rather than Poyet's tactics, then that is arguably a bigger concern.
Sunderland can easily dispose of their manager, but they cannot change the innate attitude of their team, and unless their will to win increases it looks like this season could end in huge disappointment come May.