It was a decision that paid off even with his numerous Tactical blunders during the course of the game.
He Revealed after the match that he and the other Goalkeepers during his first game against Barnsley where they checked the Goalkeepers statistics and found out Kepa had the best saving percentage.
According to Absolute Chelsea this is what Tuchel originally said;
“It is not spontaneous. We talked about it with the Goalkeepers when we came in the first cup game against Barnsley. We had some statistics. We were well prepared that Kepa had the best percentage at saving Penalties.
Many fans saw the Mendy substitution as a Tactical gamble and that change was vital to chelsea winning the super cup.