A Metropolitan Police spokesman said the arrests were made over alleged public order offences.
Six males were arrested during the game at Millwall in relation to a banner being unfurled at the game. They remain in custody at this time."
More top news
Scotland's Justice Minister is under pressure from political opponents over revelations Police Scotland carried out illegal surveillance.
Andy Murray has beaten Belgian David Goffin to win the Davis Cup for Great Britain for the first time since 1936
Mercedes' Nico Rosberg has won the season-ending Abu Dhabi Grand Prix, with team-mate Lewis Hamilton coming second