NEIL Harris revealed goalkeeper Jordan Archer was dropped for Saturday's fixture against Swansea after the goalkeeper didn't appear in Millwall's match-day squad.
Ben Amos made his league debut with Dave Martin on the bench as 10-man Swansea came from behind to win 2-1 at The Den.
Murray Wallace gave Millwall the lead in the 62nd minute before Kyle Naughton and Oli McBurnie scored in the last 14 minutes.
"My players have to respond from criticism that will come their way after three defeats. I've had some harsh words with individuals and the group," Harris said.
"You can't legislate for what happened today. I think my goalkeeper has touched the ball six times, twice to pick the ball out of the net.
"We can say we're unlucky because we get punished for every error we make – goals-per-chances conceded ratio is unbelievably ridiculous for us – but I don't buy into that. You make your own luck and at the moment the mentality hasn't been good enough.
"It has to be better from my group of players because I won't accept anything less."
Harris was then specifically asked about Archer and responded: "Jordan was left out of the starting XI. I chose not to put him in and I've just alluded to the mentality of the group not being good enough at the moment. So Dave Martin came into the squad."
Image: Millwall FC