Millwall are set to use undercover staff to gather evidence on any racist or discriminatory behaviour by their fans after four incidents at the club in 13 months. Stewards with body cameras will also be deployed.

It follows sanctions imposed on the south London club last week for racist chanting at their FA Cup match against Everton in January, which led to Millwall being fined £10,000 and ordered to implement a 12-point plan.

An FA regulatory commission has told Millwall to look into the use of “covert professional witnesses [undercover staff members] whose role is discretely and covertly to monitor behaviour”.

The FA charged Millwall after a large group of fans were filmed singing, “I’d rather be a P*** than a Scouse” during the Everton