The Metropolitan Police will include a leaflet containing homophobic comments distributed at West Ham's EFL Cup game with Chelsea on Wednesday as part of its post-match investigation.
The London Stadium fixture was marred by clashes between supporters in the closing stages, with the police making seven arrests as a result.
READ MORE: Seven arrests made after EFL Cup fan clashes
But a flyer aiming to incite homophobic chanting at Chelsea captain John Terry, which spread widely on social media, will also form part of an investigation into the scenes.
A Metropolitan Police statement read: "Police are aware of a leaflet handed out before the match containing homophobic contents.