Millwall is working with the Metropolitan Police to identify a supporter after a Derby player suffered alleged discriminatory abuse in The Den on Saturday.
Derby said the incident was reported after the game, which ended 1-1.
A statement from Millwall after the game read: “The matter is under immediate investigation and the club will cooperate fully on the matter.
“Any individual convicted of discriminatory abuse at The Den receives an immediate lifetime ban and is also offered the opportunity to complete Millwall’s ‘Fan Diversity Scheme’ course.
“The club has a zero tolerance policy against discriminatory abuse of any kind and continues its tireless efforts in this regard through the work of the Millwall Equality Steering Committee.”
A statement from Derby added: “The player will receive the full support of the club following the incident at The Den.
“Derby County would like to place on record its appreciation to Millwall Football Club for their assistance.”
The game ended in a draw after former Derby player Scott Malone scored for Millwall to cancel Festy Ebosele’s opener.
The Rams held out for a point after Nathan Byrne was sent off in the second half, but remain last in the Championship and nine points from safety after his 12-point deduction earlier in the season.
Millwall is ninth, one point out of the play-offs.
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