Millwall fans have been warned by the club's chief executive not to cross the line between banter and discrimination when Albion visit in the quarter-finals of the FA Cup on Sunday.

Millwall were charged by the FA over alleged racist chanting after beating Everton 3-2 at the Den in January.

Chief executive Steve Kavanagh told South London Press: "The Brighton game has obvious connotations. What I'm asking the fans to do is understand the line between banter and discrimination – and there is that line.

"There are chants some people consider banter and they are not.

"We're living in a world where some things are not acceptable, and rightly so. I need the fans to just remember that. They can create a great atmosphere without crossing the line.

"We've done certain things. We've written to supporters and also got the campaign ‘Hear hate? Don’t hesitate’ – if people hear discrimination, racism or any other forms then we'd ask them to report it.

"What made Everton hard was that it was a small area, a small minority – but that has tarred the club. We have put extra resources and extra stewarding in.

"Any forms of discrimination will not be ignored. The stewards and police have been told to eject anyone doing so."

Millwall opened the lower tier of the away end for the recent visit of Championship leaders Norwich City.

Only the upper section has been made available to Albion, less than the 15 per cent they wanted.

Kavanagh said: "It is a little bit police advice, safety advice and common sense. Brighton don't manage our ground week in and week out, like we do. We know the difference between the Norwich game and Brighton in the cup.

"I think no matter who it had been – whether Everton or any Premier League team – it's unlikely we’d be opening the lower tier. Norwich in the league is a completely different game, a different kettle of fish.

"We'd have liked to have given Brighton more but we have to make sure the game is remembered for the football and not anything else. Therefore we'll be risk averse. It will always be risk-based."