West Bromwich Albion have vowed to hand out lengthy bans to two Wolves fans who filmed themselves urinating on The Hawthorns pitch following Sunday's Black Country derby.
A video of the incident was posted to YouTube, showing the two men running out onto the pitch and urinating on the centre circle.
"We are looking at CCTV footage and have contacted police in an attempt to identify the individuals concerned," said a West Brom spokesman.
The video has since been removed from YouTube.