Head Coach admitted his side were not at their best, but hopes they will bounce back strongly against Preston.
Barnsley Head Coach Paul Heckingbottom felt his team did not perform to their full potential as they slipped to a 3-1 defeat to Wolverhampton Wanderers.
Dave Edwards' brace and Kortney Hause's header were enough for the visitors to secure victory, with Marc Roberts grabbing a consolation for the Reds ten minutes from time.
He thought the Reds battled strongly, but were second best on the night to the visitors.
Speaking on his side's performance, he said: "We were alright apart form the goals. We gave them a two-goal head start from not defending set pieces properly and teams are going to score from set plays.
"Edwards made the same run from the first three set plays and gets two headers but we were naive today and that's what has cost us.
"That's what we stressed after the game and that's what costs you. We'll always try and be the best team but today we were the worst.
"I'm disappointed with the goals. I spoke to the players involved and we know that, and they know that because we do it well all the time.
"What we can't do is let anybody off the hook, we try and make it as black and white as possible, we make sure everyone knows their responsibilities and then they have to do that.
"Today we didn't and that's why we get on at them because that's what comes from it, goals."
Reds midfielder Alex Mowatt was dismissed on his debut following a challenge on Jack Price three minutes before half time.
The Head Coach admitted he had not had chance to view a replay of the decision, but gave his thoughts on the challenge and Mowatt's performance until his dismissal.
"I've not watched it back, my thoughts initially were it was a red and when I watch it, if it is the same then he's let us down.
"If people jump out of tackles, we'll nail them, but if people tackle recklessly, we'll nail them as well. If they're going for the ball and they genuinely get it wrong and it can be construed as dangerous, so be it.
"But I'm speaking before I've seen it so it may be different.
"He nearly got a goal, he initially broke the play, then some quick passing, he made the third man run and found himself through so in the game, we had the better of the chances but we were naive from the set plays."
Callum Evans made his full Reds debut this evening at left-back in one of four changes to the side from Saturday's win against Rotherham.
Hecky' was thrilled with the impression that the defender made and the thinking behind his changes.
"I thought I'd freshen it up," he said. "You see the size of the squad we've got and obviously Callum made his full debut and we have debuts left, right and centre.
"We had an Under 18 on the bench and we're very light. It's a case of keeping absolutely everyone fresh and now we have another big game on Saturday.
"I'm pleased for him because last season he had horrendous injuries and the season was a write off but he showed good application and character to come back from it.
"It's a reward for his perseverance and hard work.
"He was close to going out on loan when we had extra bodies but with us not having enough players now, I couldn't afford to let him go out and he'll be glad I haven't let him go out," said Hecky.
Today, Barnsley brought in Callum Elder and Ryan Hedges from Leicester City and Swansea City respectively.
The Head Coach explained why the Club have decided to acquire their services, and added that now the window is shut, he can begin the process of rebuilding his squad.
Hecky' commented: "We desperately needed them. Callum can obviously play left-back, he's someone we looked at in the summer and couldn't get him because he went to Brwentford so we're pleased we've brought him in now.
"Ryan's another player who we think fits our mould really well, he has good pace and power, he's direct and we think he'll fit in well.
"Now the hard work starts, we've got a changeover of players and it is too much, you can't build anything and that's the frustrating bit.
"You're starting from scratch again but that's what we will do. We'll start again and keep doing the hard work and make a real strong team.
"The difference is what we've done better than most is develop a good team, make sure everyone's roles are really clear and work really hard on the training ground on those roles and hopefully the results come."
Heckingbottom also felt that the fans would be disappointed with the manner in which the Reds conceded, but added that Barnsley had enough chances to cause Wolves problems.
He said: "They can see, two set plays and they'll be as frustrated as I was but the performance was there.
"We could have, and should have had goals, a couple of headers from Marley first half, that chance from Alex, and Adam's effort after the goals.
"We more than matched them in terms of play but it's the scoreline that matters. It wasn't our night, but we move on."