CARDIFF boss Malky Mackay believes the loss of Steve Morison has been a 'massive' factor in Millwall's poor season.
Morison, who scored 35 goals in two seasons for the Lions, joined Norwich for £2.1million in June 2011 after an impressive debut campaign in the Championship.
And Mackay, speaking ahead of Saturday's clash between the two clubs, says Millwall have struggled to recover from the departure of the Wales international.
"It's massive," he told reporters. "If you lose one of the top goalscorers and one of the best players in the division, of course that's going to affect you.
"But I expect a tough game. Millwall are a team who have done really well under Kenny Jackett, someone who has stabilised that football club. I've never had an easy game against Kenny.
"They win a lot of games away from home and we'll be fully prepared."