While he concedes that his side did grow into the game, Berdyev feels that the Russian outfit's poor start cost them.
"At the beginning, Chelsea were obviously playing better. They had more initiative and scored," said Berdyev.
"I guess we just got really scared of them at some point at the beginning, especially in the first 10 to 15 minutes.
"Then we were getting better and the second half we were much better, but the third goal just ruined everything."
The return leg takes place on Thursday.