MILLWALL boss Neil Harris said he was "angry" after seeing his side capitulate against Coventry at The Den.
The away side were 3-0 up inside 24 minutes as striker Adam Armstrong and Ruben Lameiras capitalised on a Millwall defence that afforded their opponents too much space.
The home side improved marginally after the break but never really discomforted Lee Burge in the Coventry goal.
Ben Thompson added some composure to the Lions midfield after he had replaced Lee Martin at half-time but, his shot from outside the box that was easily saved and Steve Morison's volley straight at Burge aside, Millwall never really looked like dragging themselves back into the game.
Jim O'Brien completed the rout ten minutes from time before Millwall's misery was compounded when Lee Gregory couldn't turn in Morison's cross from a few inches out with three minutes left.
David Forde was caught out in the sixth minute when he was well off his line to allow Armstrong the chance to execute a brilliant lob from nearly 40 yards out, while the keeper was also beaten at his near post after Lameiras had turned back inside Mark Beevers.
Harris, though, understandably, did not single out any player for criticism and refused to be drawn on analysing the performance of Forde.
"I didn't speak individually, I spoke collectively to the group," the Millwall boss said. "We'll address that from tomorrow. I'm far too angry to speak individually at the moment.
"I'll have to speak with my goalkeeping coach Kevin Pressman regarding (Forde's) starting position but I thought it was a bit of magic by the boy to finish it.
"Forde was taking his starting position off the centre-halves, trying to push up to nullify the threat that they have.
"But I think there is a bit of magic from Armstrong to have the ability and the vision to be able to score from there.
"Jordan (Archer) grew into the game last Tuesday, he made some great saves but it's not only the goalkeeping position. We have food for thought all over the park.
Harris also felt his side only had themselves to blame as Coventry wrapped up the win before the break after Gregory had missed a penalty four minutes in.
He said: "I think the first goal changed the game, not the penalty. Missing the penalty didn't help but I think the first goal was the changing point.
"We didn't react in a good manner whatsoever.
"Even at 1-0 down you think, 'Just keep doing what we're doing and we'll get back into the game no problem', but the second goal was a real sucker-punch.
"All the goals were poor goals to give away but the second one was particularly poor. The second, third and fourth goals have all come from us giving the ball away."
Harris confirmed his squad will report for training on Sunday as they prepare for Barnsley's visit on Tuesday night.