Swansea had no excuses after their weak 2-1 opening-day loss to Cheltenham in front of 15,000 Liberty Stadium fans.
Sloppy defending cost Kenny Jackett's team dearly
"It was disappointing, they sat back but we didn't exploit the space and our passing was too long," manager Kenny Jackett told BBC Sport Wales.
"There were defensive lapses and we let in two poor, very sloppy goals.
"But we had chances and didn't deserve to lose. We know we can play a lot better. We don't necessarily need new faces - those here must work harder."
One man exempt from blame was second-half substitute Adebayo Akinfenwa, who helped spark a fightback that saw Leon Knight score for the Swans.
There's always goals in this team, but we have to tighten up defensively
Swansea striker Adebayo Akinfenwa
"I felt good, strong and fit when I came on and tried to make a difference," the striker told BBC Sport Wales.
"We had a bit of a comeback but it wasn't enough, and I was disappointed with my finishing when I had a chance towards the end.
"There's always goals in this team, but we have to tighten up defensively, from number one to number 11.
"It's sad to lose, but it's not the end of the world - there are still so many games to go.
"We have to dust ourselves off for Tuesday's visit to Scunthorpe. I firmly believe that we can go up this season."