Ferguson felt United had a blatant penalty denied when Cristiano Ronaldo was blocked by Sylvain Distin.
"It´s absolutely ridiculous," said Ferguson, whose side were denied the chance to repeat their 1999 treble success. "I cannot explain it. Managers get sacked because of things like that and he´s going to referee a game next week. He (Hackett) is not doing his job properly and he needs to be assessed."
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