Fleetwood Town struck a late winner at Middlewood Road to condemn the Owls Under-21s to a 2-1 defeat on Tuesday afternoon.
The Owls youngsters headed into the game in outstanding form but saw their five-game unbeaten run come to an end at the club’s training ground.
Liam Roberts put the visitors ahead in the 22nd minute but the Owls regrouped after the break and Luke Cook levelled from the penalty spot 58 minutes in.
In a hectic finale, Wednesday were unable to withstand the late pressure and midfielder Kyle White fired through a crowded area to beat Jack Hall and seal the points.
The fixture was scheduled to take place at Wakefield Trinity but due to a waterlogged pitch was switched to the Owls’ training ground.
There was little to separate the sides up to the midway point in the first half when Fleetwood broke the deadlock.
After bursting down the right flank, Ryan Graydon fired a low ball across goal and Roberts reacted first in the box to drill low and hard past Hall.
Fleetwood then passed up two golden opportunities to increase their lead before the break.
Captain Will Johnson missed the target from close range from Harrison Holgate’s cutback before experienced striker Jayden Stockley saw his header from four yards cleared by Gui Siqueira on the line.
After storing 45 minutes in the tank, Michael Ihiekwe was replaced by Jarvis Thornton as the Owls switched up their formation, going with three at the back.
Wednesday began the half bright and twice defender Connor Teale made superb blocks to deny Favour Onukwuli and Cook from testing the goalkeeper.
But the same man could not stop Sam Reed going through in the box and a mistimed lunging challenge gave the referee no choice but to point to the spot.
Cook slammed the ball beneath Donaghy from 12 yards to restore parity just before the hour mark.
Joey Phuthi’s pace and trickery created another opening for Cook ten minutes later but the striker’s low effort towards the near post brought a routine save from the keeper.
There was a feeling the game could go either way approaching the final ten minutes as Jay Buchan hit firmly on target only for Donaghy to get two strong hands on the ball and push away from danger.
Fleetwood, though, then took control in the late stages and Sam Fishburn forced a terrific stop from Hall from point-blank range.
The resulting corner saw Holgate hit the crossbar with a stinging effort and just as it looked as though the Owls had weathered the storm, Fleetwood struck a minute later to snatch the win.
Pharrell Brown broke through into the box and brought a save from Hall only for the rebound to fall to White, who struck through a crowd of bodies and into the bottom corner.
SWFC: Hall, Siqueira, Ihiekwe (Thornton 46), Adetoro, Flannery, Reed (Johnson 87), Shipston, Buchan, Onukwuli (Fernandes 70), Phuthi, Cook