"It's time to move on and to focus on the Champions League match this Wednesday," Mata wrote on his official website.
"It's like a final for us if we want to finish first in our group. Besides, in Ukraine, Shakhtar proved to be a top team who are able to beat anyone.
"Even so, we always have a great support at the Bridge and I'm confident that we will get a victory to face the last two games in a good position. Champions League nights at the Bridge are always special."
Chelsea are currently second in Group E with four points from three matches, three points behind leaders Shakhtar.