West Ham have taken the unusual step of banning supporters from taking half-and-half scarves into the London Stadium for the team's Premier League clash with London rivals Tottenham Hotspur on Saturday.
The scarves, which are often sold by unofficial vendors outside football stadiums, have long been the subject of consternation from regular match-goers who reject the idea that someone would wear memorabilia showing both teams rather than exclusively the one they support.
The move was communicated to fans as one of a number of "increased security measures" West Ham say have been designed to stop away supporters gaining access to home sections of the ground.
Saturday's match has been identified as having the potential for volatility due to the traditional rivalry between the teams.