In defending the move, the FA has also cited the extra capacity Wembley offers, although the 2013 fixture between Millwall and Wigan led to the unprecedented step of placing 6,000 tickets on sale to neutral fans after the game failed to sell out. A fan poll by The Guardian in 2013 found 86% opposition to Wembley semi-finals.
Has the game ever fail to sell out? 
the 2013 fixture between Millwall and Wigan led to the unprecedented step of placing 6,000 tickets on sale to neutral fans after the game failed to sell out.