Swindon have been thrown out of the Vertu Trophy by the English Football League for fielding two ineligible players against Luton Town, meaning the Hatters are instead through to the quarter-finals.
The Robins were charged by the EFL and Football Association following their 2-1 win against Luton last month.
Captain Ollie Clarke started the match while he was already serving a suspension and Aaron Drinan was used as a substitute despite not appearing on the teamsheet.
Luton will now take on Plymouth Argyle at Kenilworth Road in a last-eight tie, but not on Tuesday, 10 February as originally scheduled.
The EFL said the new date for the tie would be confirmed in the next 48 hours.
Swindon have also been fined £40,000, with £20,000 of it suspended, which will be automatically payable if they field or name on a team sheet an ineligible player before the end of the 2026-27 season.
Swindon said they were “deeply disappointed” with the decision.
“We strongly believe this outcome is unfair and do not agree with the findings,” a club statement said.
“That said, we respect the disciplinary process and the authority of the commission.
“Right now, our focus has to be on moving forward together as a football club. We will take time to reflect, learn from what has happened, and make sure we continue to meet the highest standards in everything we do.
“Above all, our priority remains with our players, staff, and supporters. We will keep backing them fully as we push on and compete with everything we have in our remaining fixtures this season.”