Neil Harris has issued a rallying cry ahead of the "biggest game of the season," saying a deafening Den could be the difference in The Lions' push for promotion.
Millwall can secure their place in the play-offs with a win against Oxford on Saturday afternoon, provided seventh-placed Southend United lose to relegation-threatened Shrewsbury.
"It's the biggest game of the season, without a shadow of a doubt," Harris told millwallfc.co.uk
"I'm asking for all our fans to come down and help us one last time. The support our fans have showed us this season has been excellent and we need that again for our last regular season match at The Den.
"All we can do is worry about ourselves and hope other results go our way. We're in good form and go into this game off the back of some fantastic performances over the Easter weekend."
The Lions kick-started their Easter double-header by comfortably dispatching Northampton at The Den and can feel unlucky not to have rounded out the weekend with victory over Fleetwood Town.
Harris' men had nine shots on target and sixteen corners, but it was the Cod Army who ultimately snatched a 1-0 victory at Highbury Stadium.
"I couldn't have asked for a better performance from my players at Fleetwood," Harris added.
"It was one of those bizarre matches where fate deals you a hand and we just couldn't score. We hit the post, the bar and the keeper made some fantastic saves but we couldn't score. Then we get stung from a set piece at the other end - but that's the way it goes."
Neil Harris says he will give "every opportunity" for Tony Craig and Shaun Hutchinson to prove fit but admits the match may come too soon for the recovering defenders.
"Tony hasn't played for a number of weeks but he saw a specialist this week and had some treatment on his quad.
"We're hoping to get some minutes under his belt on the training pitch before we make a definitive call."
Shaun Hutchinson suffered a fractured rib in the defeat to Fleetwood but may be in line for a return to the centre-back role as early as Saturday.
"It's a minor fracture in his rib. It's not as bad as it sounds but there's a risk of more serious injury if he takes another knock.
"He's a warrior and a strong character and he has had to be patient to get back into the team. Since he has come back he's been outstanding for us and he will want to be involved if he can.
Meanwhile, Oxford United boss Michael Appleton will be without the services of forward Toni Martinez after the West Ham loanee suffered a knee injury, while U's midfielder Liam Sercombe is unlikely to feature after missing the last three matches for disciplinary reasons.
And a reminder that all food and drink kiosks will be open around The Den for Saturday's match.