AIDEN O'BRIEN admitted Millwall players were "down" after Tuesday night's defeat to Bolton.
A fifth league loss in six games leaves the Lions above Oldham in the relegation zone only on goal difference.
Shola Ameobi and David Wheater scored in the first and last five minutes to inflict a second home defeat on Millwall in the league this season.
By the time Neil Harris' side face Fleetwood this Saturday it will have been more than two months since they recorded a league win at The Den.
Millwall couldn't find a way to break down a Bolton defence that included former Lion Mark Beevers. The closest they came was through Steve Morison's first-half header that was saved by Mark Howard.
But O'Brien wants the side to put the disappointment behind them as they get ready to take on Fleetwood.
"Watching from the sidelines from the start we had a lot of chances to score but the keeper has made a few good saves," O'Brien said. "It just wasn't our night.
"Everything that we did in front of goal, it just wasn't happening. We've just got to carry on and hope we get the win on Saturday, that's the main thing.
"I thought Beevs was excellent, Wheater was excellent, winning their fair share of headers. On another day the chance that Moro had when he flicked it on and it hit the goalie (goes in), he didn't have a clue where it was.
"Everyone had a little word with Beevers before and after, he was a big part of the team, as everyone saw last season.
"We need to come back stronger on Saturday, work hard on the training pitch on Thursday and Friday, get ready for Fleetwood at home.
"(Tuesday night) is gone, they got the three points and are happy, we're all down and sad but things can change."
O'Brien returned to the side after he was originally expected to be out until the end of October with the knee injury he picked up against Rochdale.
And he wants to quickly regain the form that saw him score in three successive games before his setback.
O'Brien said: "I thank the physio and sports science staff for getting me back as soon as they did. On the positive side I was happy to get out there and shake off all the cobwebs.
"I was in flying form before I got injured, scoring a few goals. I just need to get back into the flow of things and hopefully we can get going again."
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