NEIL Harris backed his young players to turn Millwall's form around after Chesterfield became the latest side to leave The Den with three league points.
Jay O'Shea's double gave the Spireites the win as Millwall's losing home run stretched to four games.
Harris acknowledged that the Lions were second best in the first half, but was frustrated that a much-improved performance after the break went unrewarded.
He had replaced Lee Gregory with Aiden O'Brien at half-time, injecting more pace into the side, and Jimmy Abdou almost equalised 15 minutes from time but Tommy Lee pushed his deflected shot away.
Harris said: "I thought we started okay but then their midfield dominated, possession-wise.
"After 35 minutes we got a foothold back in the game, came in at half-time and made a change to give us more of a link in the play.
"In the second half we were the much better team. I think what summed it up for me is Jimmy's deflected shot is saved by the keeper going the wrong way, and at the other end their deflected shot ends up in the back of the net.
"We weren't clinical enough, we created chances but weren't clinical enough. It's getting the mix right between being an attacking threat and creating chances and being solid at the back, and it probably wasn't quite right today.
"I think the sucker-punch was the second goal, the first one was a great strike. If we had been more clinical in between then the result would have been different.
"Tactically we changed it with Aiden giving us that link in the play rather than being more direct and that certainly helped, it enabled us to make that extra pass at times.
"We were disappointed at half-time, we know we didn't play well in the first half.
"We just said at half-time, go out and enjoy yourselves, express yourselves. We're going to make mistakes with young lads in the team, they're going to get things slightly wrong.
"But I hope we don't get punished every time we make mistakes as a group."