A 2-1 defeat to Wigan at home at the weekend saw angry Stadium of Light fans turn on the team and manager Steve Bruce, and leaves the Wearsiders only two points above the dropzone.
The Sweden international feels that The Black Cats need to start scoring, or face a tough season.
“We’re just not good enough in the final third, let’s be honest,” the 26-year-old told the Sunderland Echo.
“No disrespect to Wigan, but we should be winning those types of games. We got off to the start we needed and the one we wanted to.
“We could have been two or three up after the opening 30 minutes, but that’s been our problem all season. We don’t take our chances.
“We don’t put the game beyond doubt and we did the same thing again. They got a penalty and in the second half, it gets nervy and edgy. When we got down the sides of them, we weren’t good enough,” he stated.
Steve Bruce faces a disgruntled fanbase after the result, with many calling for the coach’s head. Despite this, Larsson feels Bruce is the man to lead a Sunderland revival.
“I still believe he’s the right man for the job. But I’m not surprised by how the fans reacted. We lost a game at home that we should have won if we want to get to where we want to be.
“We have to take a long look at ourselves and see why things are going the way they are.
“That’s the Achilles heel, because we haven’t conceded that many goals,” he concluded.
By Gareth McKnight