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Around 30,000 Frankfurt fans attended the club’s win over Barcelona at the Camp Nou in the quarter-finals despite only being allocated around 5,000 tickets.
West Ham are confident of avoiding something similar happening at the London Stadium due to a number of security measures.
The club expect most home tickets to sell out to season-ticket holders and the game is not expected to go on general sale, stopping Frankfurt fans from buying tickets in the home end.
There is potential for trouble around the tie after West Ham and Frankfurt fans clashed when their sides played last-16 ties in Seville during the same week last month.
Frankfurt played Real Betis in the Spanish city a night before West Ham lost 1-0 to Sevilla. After the Frankfurt game, a number of German fans targeted West Ham supporters in a bar, with bottles thrown before police intervened and fired rubber bullets.
Speaking to German outlet Hessenchau, Krösche said: “The English want to be tough there. I hope that there are still more in the city. This feeling does something to us.”