The Sydney Football Club has contacted the AFL regarding an incorrect umpiring decision that saw the expansion side denied a crucial a goal during its close loss to Essendon at Princes Park on Saturday afternoon.

The league's subsequent acknowledgment that the correct decision had failed to be made only adds salt to the Swans' wounds as they continue to search for their first AFLW win.

As first reported by Daniel Cherny of CODE Sports, a set shot from Sydney's Molly Eastman was awarded a behind rather than full points during the third term of the tight clash.

At the time of scoring, the Swans sat in arrears of their host by just four points - the eventual margin at full-time.

As can be seen from the footage procured by Cherny, the 24-year-old's shot to the Royal Parade end of Princes Park split the centre of the goal face, however, only a minor score was registered.

Speaking to CODE Sports in the wake of the revelations becoming public, Sydney's GM of AFLW Kate Mahoney claimed the league had owned up to the blunder.

"We contacted the AFL after the match and they acknowledged the mistake via email," Mahoney said.

"The players were shattered after the match and whilst we will never know what the outcome (would have been) if the goal had been awarded, it's disappointing to have to wear a decision like that in an elite football match."

At present, AFLW fixtures do not have ARC (AFL Review Centre) technology available to them, meaning that the prospect of overrules at crucial junctures remains a pipe dream.

Sydney will now turn their attention to trumping Fremantle at home on Saturday afternoon, with the fixture to take place at Henson Park at 3:10pm (AEST).