Sir Alex Ferguson has admitted little can be done to silence those who are determined to cause problems at Anfield on Sunday.
The Manchester United boss has expressed his disappointment at the small number of supporters who sang anti-Liverpool songs at Old Trafford last weekend. Ferguson had already called for a line to be drawn in the bitter feud between United and Liverpool fans in the wake of last week's official verdict into the Hillsborough disaster in 1989.
With United set to visit Merseyside this weekend, Ferguson said: "It is a minority. But in society there is a minority wanting to be heard."
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