Horncastle Town have been thrown out of the Lincolnshire Junior Cup for including an ineligible player in the win over Spalding Town in the previous round.
Tom Sargeant - who scored an extra time winner to book Town’s place in the quarter finals - should not have played.
Prior to joining Town, it has emerged Sargeant had made a brief appearance as a substitute for Fulbeck in an earlier round of the same competition.
Town stress is was a ‘#genuine mistake’ and attach no blame to the player.
A Town spokesman said: “The club fully accept and understand the decision to remove us from the competition and would like to apologise for the error to our supporters, the Lincolnshire FA and to Spalding Town for what was a genuine mistake.
“Horncastle Town Football Club wish to express that in no way is there any blame attached to Tom Sargeant and he will continue to have the full support of the club.”
The setback is a blow to Town who had high hopes of winning the competition after some outstanding results in recent weeks.
Sargeant is just one of several recent signings who have made a big impact at The Wong this season.
It’s likely Sargeant will figure in the squad for the top-of-the-table clash against Skegness United at The Wong tomorrow (Saturday) in the Sills and Betteridge League (ko: 3pm).
It promises to be a major test of Town’s character after the cup setback.
They go into the game in third place in the table, three points behind leaders United. However, Town have three games in hand.
Boss Paul Johnson could welcome back a handful of key players who missed the 2-1 win at Spalding last week, including first choice keeper Lewis Burchnall.