KNOWN soccer thugs were targeted by undercover officers at Saturday's local derby between Wanderers and Blackburn Rovers.
The police "spotters" mingled with fans in a bid to identify hooligans at the Reebok match.
It comes after disturbances during Wanderers' clash with rivals Manchester United on January 29.
Bolton Police arrested three men on Thursday in relation to trouble during the match at the Reebok stadium.
The men, all from the Bolton area, were arrested at their home addresses for serious public order matters at the Middlebrook shopping complex.
A spokesman for Greater Manchester Police said: "Inquiries in relation to others involved in the disturbance are continuing.
"Extra police spotters will be on duty at forthcoming Bolton Wanderers games, including this weekend's fixture against Blackburn Rovers, in an effort to identify those who were not arrested."
Anyone who witnessed the disturbances at Middlebrook should ring Crimestoppers on 0800 555 111.
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