West Ham United are keen to ensure their Europa League semi-final against Eintracht Frankfurt passes without trouble, with extra police officers called in to help control potential unrest in the stands.
There are fears that the German side will bring over thousands of ticketless supporters for the first leg of the tie on Thursday week, after 30,000 arrived for their quarter-final success over Barcelona.
But discussions have already taken place and are continuing between both clubs, the London Stadium operators and police over how to control the much anticipated clash.