The game, was originally scheduled to take place on Monday 21st July, was called off after The Lions received a letter from UCD informing the club of their decision.
"(we) regret to inform you that UCD AFC will not now be in a position to accept your offer to fulfill the fixture," read the letter. "Due to the costs involved in hosting the game and the potential financial loss to UCD, a risk the club can ill afford to take."
With so many fans travelling over to Dublin for the short tour, Millwall attempted to find a replacement but were unsuccessful. The tour will therefore come to an end following The Lions' game against Bray Wanderers.