A man has been arrested in connection with allegations of racist abuse aimed at Leeds striker El-Hadji Diouf by Millwall fans.
The 53-year-old man was arrested after Sky Sports News last night broadcast footage which appeared to show some of the London club's fans hurling insults at the Senegalese forward during a game at the Den in November.
Millwall Football Club said it was "appalled" by the footage and vowed to reopen an investigation into allegations of racial abuse, which initially emerged online.
Club captain Danny Shittu said he was "deeply saddened" by what he had seen in the documentary.
The man, from Enfield, north London, remained in custody tonight on suspicion of a racially aggravated public order offence, a Metropolitan Police spokesman said.
The Football Association has contacted Leeds United to ask for El-Hadji Diouf's version of events as part of an investigation into footage which showed the striker being racially abused during a match at Millwall in November.
The film appeared to show the Senegal international alerting the referee, Mark Halsey, and making stewards aware of his allegations but Millwall insisted no complaint of racist abuse was made by the player at the time.
The FA is now investigating the footage - and not just the incident with Diouf. It is understood Leeds have provided the governing body with the Senegal striker's version of what happened.
An FA statement said: "We were concerned by the video footage and we have requested a copy for our full consideration. We will work with all the relevant authorities including the police to investigate fully."