Kepa is the second-choice goalkeeper at Chelsea at the moment, with Edouard Mendy the number one between the posts.
The 29-year-old Senegal international goalkeeper joined the Blues from Rennes last summer and has been one of the better players in his position in the Premier League this season.
However, it was Kepa who started for Chelsea in the London derby against Arsenal at Stamford Bridge on Wednesday evening.
Chelsea manager Tuchel has said that despite conceding against Arsenal, Kepa will stay in goal for the FA Cup final against Premier League rivals Leicester City at Wembley Stadium in London on Saturday.
Tuchel told Chelsea’s official website: “We thought it was a good idea to give him the game before because first of all we trust him and he deserves it. That is the basis that we put him in the line-up.
“He is so close and so good in training that we wanted to give him some minutes and to take both games together. It was an unlucky night for him as well.”