The Spaniard once again stepped up in a penalty shootout to help Chelsea reach the Carabao Cup quarter-finals.
Speaking about Kepa to the club's website, Tuchel said: "He produces. He is full of confidence.
"He has this experience now with us, and he has done it again and again.
"Just because you win a penalty shoot-out, does not mean you will do it again. Full credit to him.
"It's a special thing in football and we were again concentrated and calm. Kepa was a big part of that."
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