Blackstones are reliant on another result saving their United Counties League Premier Division status after losing 3-0 at Long Buckby in their final match on Saturday.
Dave Stratton’s team remain one point clear of second-bottom AFC Kempston.
The Bedfordshire side will leapfrog Stones if they can draw or win against Sleaford in their outstanding fixture tomorrow.
Stratton said: “I’ve been involved in football for 22 years and never seen a worse 45 minutes than what we produced in the first half at Buckby.
“The lads were pumped beforehand but there was nothing out on the pitch. I just wanted to curl up and hide.
“It was embarrassing and I’m resigned to the fact that we are down, but I’ll do my utmost to ensure it is only for one season.
“If we do get relegated on Saturday then we have to meet the challenge head on and come straight back up.”
It comes as Stones U18 manager Tony Maher has joined Stamford AFC.
The Stones wish him well but are looking for a replacement. Anyone interested can call Ian MacGillivray on 01780 762263.