The £72m signing, who has largely lost his starting role since Edouard Mendy signed for the club in 2020, was once again the hero and saved from Theo Walcott in a penalty shoot-out before seemingly putting Will Smallbone off ahead of his spot-kick.
Reece James then scored the winner in a 4-3 victory and Tuesday night’s heroics were the latest installment of what is becoming a theme in Kepa’s Chelsea career.
“He produces and is also full of confidence,” said Tuchel.
“He has good experiences with us but we have to do it again and again.
“Just because you won a penalty shoot-out does not mean you do it again. Full credit and it is a special thing in football and he was again very concentrated and calm.
“Kepa was a big part of this.”