Arsenal have been sanctioned for refusing to provide Manchester United with their full allocation for the FA Cup third-round tie at the Emirates in January.
United were left frustrated after being given 8,000 tickets for the clash, 1,000 less than their entitlement under competition rules.
The Gunners had cited safety concerns as the reason for the decision, which United unsuccessfully challenged with the FA after making several complaints to the organisation in the lead-up to the match.
The seats in question were in an upper tier of Arsenal's 60,000-capacity Emirates Stadium and were left empty - despite United offering to handpick recipients, and ensure they went to families and children linked to the club's charity arm.
United then suggested they be handed to emergency service workers and those involved with FA grassroots projects, which was also rejected.
In a statement on Friday, the FA's Professional Game Board said Arsenal had been given a suspended £500,000 fine for failing to provide United with their full entitlement.
'The fine is suspended pending Arsenal FC's confirmation that it is able to comply with this requirement for the 2025-26 FA Cup third round and continued compliance for any further rounds of this season's competition,' the statement read.
Arsenal's argument was United have been handed a 13 per cent allocation, with competition rules stating 'up to 15 per cent' should be offered.
The decision was taken by the Safety Advisory Group, which involves club officials, council officers and members of the emergency services.
Last season, Liverpool were given a similarly reduced allocation amid concerns over persistent standing in the upper tier.
United won the tie on penalties, Joshua Zirkzee scoring the deciding spot-kick following a fractious 1-1 draw after extra time.
jiuabkosz
1
if they like they shouldn't allow any Utd fan into the stadium, till the end of the world, Utd are better and best in everything than them..underdogs without threat.
You may be better than Arsenal and that's history now because your glory days are far gone. A league two side comfortably eliminated Man UTD from the carabao cup this season.
Rudceklmnr
1
dark arts tactics never worked as man utd playing for over an hour with 10 men swept them aside
fibilortuz
3
if they like they shouldn't allow any Utd fan into the stadium, till the end of the world, Utd are better and best in everything than them..underdogs without threat.
wusbmnrsz
3
Arsenal is Master of Dark Arts in everything thatswhy they r CURSED [Crylaugh][Crylaugh][Crylaugh][Crylaugh]
GunnArs
0
let those underdogs pay for their SINS
good one 🤣👍
hoybkmopst
3
let those underdogs pay for their SINS