The Blues had to work hard to get into the fourth round, with the game finishing 1-1 after full time.
Despite making a lot of changes to his side, Tuchel still got a good performance from his team against a spirited Villa outfit.
Asked about his Spanish keeper post-game, Tuchel told the club website: "Kepa is very strong at penalties. He has good experiences in shoot-outs so we focused on that, and tried our best.
"I'm happy the players kept their cool. It's a nice win and I'm happy because it was a tough match, a hard cup fight, and it's a good feeling to win."
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