The match is a midday kick off and Millwall are running subsidised coaches to the CCS at a cost of just £10.00.
Fans wishing to travel independently can do so.
A statement on the Millwall official website reads:
We are grateful to Cardiff City and the South Wales police who, following lengthy discussions with ourselves, have resisted the temptation to impose a voucher system for this game.
There will, likewise, be no travel restrictions for Lions fans travelling to South Wales but we would strongly encourage supporters attending the game to take advantage of our discounted official coach offer.