Millwall fans fought among themselves at Wembley Stadium, overshadowing Wigan's 2-0 victory that advanced the club to the first FA Cup final in their 81-year history.
Millwall beat fellow second-tier club Blackburn Rovers 1-0 in an FA Cup quarter-final replay on Wednesday.
The second-tier clubs will meet on Wednesday at Ewood Park as they chase a place in the semi-finals at Wembley Stadium.
John Marquis scored late to give Millwall a 2-1 victory in the FA Cup.
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