Veteran defender believes woes going forward are tantamount to his side's poor performance this season but looks to rectify past results against West Brom at the weekend
The Black Cats have just five points after six matches so far this term, but the former Manchester United utility man insists none of his team-mates are hanging their heads.
"I wouldn't say it is back to square one," he told the Journal. "It is disappointing and we are not trying to hide the fact.
"We went to Norwich very confident of getting the three points, but we didn't perform well enough.
"We know we need to improve, but the players and everyone behind the scenes are working hard to make it happen.
After the 2-1 loss to Norwich City on Monday, Steve Bruce's side have only managed to score more than once in one match this term, and O'Shea believes his side's attack probably hasn't been consistent enough.
"We are not creating too many clear-cut chances," the 30-year-old said. "We are not testing out back fours either.
"The consistency is what we need to find now. Some of the performances have been so good and others have been so bad.
"We have to find that level we know the players are capable of."
Sunderland host fellow underperforming side West Bromwich Albion on Saturday, and the Republic of Ireland feels that his side should be chasing all three points.
"There is no better opportunity than at home to West Brom," O'Shea added.