Skipper sounds the war cry ahead of basement battle
"We seem to have one of these once a year," said skipper Dunney. "I don't know what happens but it's just one of those things that happens. I can assure you that this is our one for the year.
The Lions' 5-1 hammering at home by Middlesbrough on Saturday leaves Ian Holloway's charges just two places and two points ahead of third from bottom Brighton, who were beaten 3-0 at Derby.
Both Millwall and The Seagulls are flirting at the wrong end of the Championship table following a League run of one win in 15 and one in 16 respectively.
Alan Dunne expects his Millwall team-mates to pick themselves up, dust themselves down and get back the season back on track when The Lions head to the south coast on Friday night for a battle at fellow strugglers Brighton & HA.
"I can guarantee it won't happen again. Things can change very quickly. I know we will bounce back and be a different team – you won't recognise the same team at Brighton.
"Yes, it's unacceptable and yes it's not right but we have to move on from it. We have got another game on Friday and if we win that we will go 16th. That's how easily things can change in this league.
"I don't think it's a crisis at all, it's just something (playing 3-5-2) we tried and it didn't work. The Den is a tough place to play and this shows that we have to be at our best to play at this place.
"Boro were very good. Their movement up front was very good and their movement hurt us, but I think tactically we might have just got it wrong at the back.
"The early goal was always going to make it hard. But Middlesbrough were a very good side, well organised and you can see that they had talent in their team.
"The chemistry between the fans and players is so important but it felt flat right from the off. It was flat before the game and we didn't start well. I think there was probably only one tackle in the opening 20 minutes and that was a foul by me.
"This is Millwall – you need to get the crowd behind you very early on with tackles, headers, shots and crosses and players are only learning that and experiencing it now.
"You can't wait until you're 2-0 down to start trying to set a tempo, you need to set a tempo from the off.
"I think players are learning that it can be a tough place to play when things aren't great but there's no better place when our fans are behind us.
"It's still early days and we're not halfway through the season. I still think that we will finish in the top half."