Police are on alert amid concerns that Liverpool supporters will attempt to buy tickets in Manchester City sections of Wembley for the FA Cup semi-final.
The North West rivals play in the capital a week on Saturday, despite no direct trains running from either city.
And although Liverpool — with a bigger fanbase — are expected to sell all of their 34,000 allocation, the same cannot be said of City.
Following sales to season-ticket holders and members, those who have previously been to three matches at the Etihad Stadium can now buy as many as four tickets per person.
After discussions with the FA, City will not put the tickets on general sale.
However, Liverpool fans on social media have boasted about being able to obtain tickets in City areas, and this has been noted by officials.
Multiple tickets in City sections were for sale online on Tuesday night at face value.
The prospect of Liverpool supporters in City sections is expected to form part of the police’s planning for a fixture that has been beset by problems.
Senior police sources said they were aware of the situation and would be planning accordingly.
A Wembley spokesperson said: ‘Spectators identified in opposition areas will be immediately ejected.’