Chopper is looking for a response from his players at The Den on Tuesday night
Millwall boss Neil Harris has suggested that he will shuffle his pack for tonight's visit of Barnsley.
But Tuesday night's match against Lee Johnson's side is a chance to make amends for that display and Chopper has hinted that there may be some changes to his starting line-up.
"It's a great opportunity for us to put things right that were wrong," he said.
"I'm delighted that the game has come as quick as it has and it's at The Den. We will be better, that's for sure.
"People have got to take responsibility for individual and collective mistakes.
"There's not a blame culture; it's about learning from mistakes. If there are consistent ones then team line-ups need tweaking and I'm certainly thinking about changes to the team.
"There are players who have been knocking on the door desperate to play and did well in pre-season. Maybe they need an opportunity to come in."
Speaking about the challenge The Tykes will present his side with, Chopper added: "Barnsley are a good team and it's another stern test for us.
"They will be well organised and they will definitely be physical, but they've got some good footballers as well.
"Lee manages and has his team set-up the way he used to like to play and he was competitive but could play as well.
"It will be a tough challenge but it's a good one for us. We will be prepared, we will have our game plan sorted and we are certainly looking forward to the battle."
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