The 4-0 reverse was Juve's worst ever result in the Champions League.
Tacchinardi said on Sportmediaset: "Tonight they betrayed the whole team a little.
"In the second half Chelsea accelerated, had two or three gears more than Juve and we saw the difference in everything.
"A bad result, a bad second half. In the second half Juve collapsed, this team takes two steps forward and then ten steps back. You feel the pressure and awareness of the difficulties in the declarations of the directors."
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