The Blues slipped to a 3-0 defeat away in Turin, meaning they can only qualify from Group E if Shakhtar Donetsk beat the Serie A champions in their last game.
Even if the Ukrainians achieve this result Chelsea will need to overcome FC Nordsjaelland to advance.
Cech believes that qualifying is now down to luck:
“We said before the game we had our destiny in our own hands but not anymore.” He told SkySports.
“Now we have to do our bit to win our last game and hope destiny will be kind to us.
“Being realistic, Juventus played really well and they need a point. Shakhtar have already qualified so they don’t need to take a chance on the result.
“It is a very sad moment because last season the Champions League was like a dream.
“I wouldn’t say it’s a nightmare but it’s a huge disappointment.”
The Czech Republic stopper insisted his side played well, but that Juventus deserved the three points:
“I think we showed much better spirit than in the last few games.
“We did well and created some chances but in such an important game if you create chances you have to take them and that was the difference.
“They went ahead with a lucky deflection and the second goal was a deflection as well but they put on a very good performance and they did really well.”