Defiant Gainsborough Trinity are refusing to accept their Wembley dream is over.
The Blues are trailing by two goals in their FA Trophy semi-final against Wrexham, following a 3-1 defeat in Wales last weekend.
However, with the Northolme set to be full to bursting, Trinity's fans are backing their side to pull off a momentous comeback and send Wrexham packing when they play out the second leg of the tie on Saturday.
"I am no Uri Geller, but I want everyone to go to sleep on Friday night whispering the word 'believe'," said Housham, whose side are vying for a showpiece final against either county rivals Grimsby Town or Dartford.
"And 'believe' should be the first word they repeat on Saturday morning. We need everyone to have that belief that we can turn this around.
"We were gutted to concede a goal right at the end last week to make it 3-1, but it's just a two-goal lead at half-time and it is not insurmountable.
"I looked into the lads' faces after last week as they got on the coach to come home and I can honestly tell you they believe they can do it.
"They were disappointed with how they played in Wrexham, the occasion probably got to one or two, but they truly believe they can turn it around.
"The first 15 or 20 minutes will be vital. We have to start well, without being gung ho, and if we can get an early goal, you never know, we may see Wrexham wobble."
If Trinity are to overturn their first leg defeat, Housham and club chairman Peter Swann will need the backing of a passionate Northolme crowd.
And with around 3,000 fans expected on Saturday the Trinity pair may get their wish.
"We have sold around 1,000 tickets already and the away allocation (1,200) should be sold," said Swann.
"We want to try to boost the attendance up to 3,000 to create an atmosphere which will pull the lads through the game and hopefully get the result we want.
"With Wrexham now top of the Blue Square Bet Premier, Trinity face the best non-league club in the country for a place at Wembley and we do believe we can turn it around. But we need our fans and the town to support us."
Trinity warmed up for the biggest game in their recent history with a fine 3-0 win at Histon on Tuesday evening, with Bradley Barraclough making his first start and scoring his first goal since his return to the club last week.
The other goalscorer on the night was Craig Nelthorpe, who hit two as Trinity moved up to fourth in the Blue Square Bet North.