Greater Manchester Police is to increase security for next weekend's Manchester derby, Press Association Sport understands.
Trouble marred last December's meeting between City and United at the Etihad Stadium, with visiting defender Rio Ferdinand hit by a coin before being confronted by a fan who managed to get on the pitch.
The two sides meet at the same venue on Sunday, September 22 and safety measures will be ramped up in order to prevent any flare-ups.
It is understood officers will patrol areas with a bid to cutting out graffiti - messages have previously been painted about the Munich air disaster and the death of ex-City midfielder Marc-Vivien Foe - while specially trained dogs will hunt for flares carried by supporters.
Officers will also be given protective eyewear, although only to those on the segregation lines, while hand-held cameras will be used in the wake of key incidents such as goals.
The police are also expected to increase public warnings in the days building up to the game.