Millwall boss Neil Harris has urged fans to behave ahead of their clash with Tottenham in the FA Cup
League One Millwall were the subject of an FA investigation after hundreds of fans invaded the pitch The Den pitch after their fifth round win over Premier League Leicester.
There were several arrests as fans clashed on the pitch and missiles were thrown, police horses having to be brought in to restore order, and police later issued an appeal for 18 fans, pictured on the day, to be identified.
Harris, whose side have so far knocked out three Premier League teams on the way to the quarter-finals, said: "It will be a terrific atmosphere that's for sure.
"Our fans are going to travel in numbers and I want them to enjoy themselves and enjoy an FA Cup quarter-final occasion. Support the team. I'd say to both sets of fans just come and enjoy the game and certainly be proud of your team but be loud also.
Millwall fans invading the pitch after their FA Cup win over Leicester
"It can certainly bring some good press for us. As a club, of course you want to paint yourself in the right light. It is a competition that has been good to us this year. We certainly want the focus to be on on-pitch activities.
"We could have sold out our allocation three or four times over because they're proud of the players they see at the moment.
"Tottenham have a great following. White Hart Lane is a football cathedral with a good passionate crowd. It's the last game at the Lane in the FA Cup. Millwall in town with nearly 4,000 fans is going to be an electric atmosphere, one we should all embrace and look forward to."
Police met both sets of club official and supporters groups last night to talk over security arrangements or the game, with the tie classified as a Category C-IR – high risk match.
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Millwall sold out their 3,681 allocation for the game, after successfully lobbying for 900 extra seats from Spurs.
Meanwhile, though, young Lions goalkeeper Jordan Archer, who joined the club from Tottenham in 2015, is facing a race against time to be fit to face his old club, having picked up a groin injury against Leicester.
Harris said: "We are hopeful that Jordan will come back into the group before Sunday but at the moment he is still a way off. He has just not been able to shake it off last couple of weeks.
"Obviously with what it means to him as an individual it is driving him on to really have a go, but we have to sensible, because we have got a lot of big league games left. At the moment we are looking at about a 40-/60 chance."
If Archer does not make it, youngster Tom King, who has featured in the last four games for the promotion-chasing Lions, will continue to deputise.