The defending European champions went down 2-1 to the Ukrainian side at the Donbass Arena, but the Italian refuses to read too much into the loss.
"I think we have to just look at this performance as a single one," he told Sky Sports News.
"They are a very strong team and they showed that again tonight. It's a difficult group we are in and the Champions League is always very competitive.
"You look at the other result in our group (1-1 draw between Nordsjaelland and Juventus) and it shows just how competitive it is."
Chelsea are currently second in Group E with four points from three matches.