Millwall boss, a former Cardiff player (briefly), Neil Harris is relishing the trip to south Wales on Saturday.
His side have failed to win away from the New Den this season but have proved difficult opposition at home and sit just in the bottom half of the table.
But Harris is happy to be second favourite.
“They (Cardiff) are the biggest team I have seen at this level,” said Harris. “It is going to be a real challenge but what an opportunity for Millwall to go there as an underdog, to go there and try and get a first away win of the season against a team flying high.
“We have got nothing to lose in this one.
“It’s a chance for us to go and upset the applecart and that is when we’re at our best.”