Thomas Tuchel insists Kepa Arrizabalaga's introduction after extra-time against Villarreal in the Super Cup was planned.

The Spaniard replaced Edouard Mendy in goals after 120 minutes of play.

The move proved to be a stroke of genius as Kepa twice denied Villarreal to hand Chelsea the trophy.

Asked about the substitution, Tuchel told reporters: "It was not spontaneous. We talked about it with the keepers. We were well prepared.

"Kepa is the best in percentage in saving penalties. The analysing guys showed me, introduced me to the data, then we spoke to the players. It was fantastic, how this talk went, and since then they know.

"We have to do what's good for the team, so if we needed a sixth change before then [we wouldn't do it], but I'm happy with how it went.

"This is proof that Kepa is better in this discipline. I'm happy for the players, that Mendy did not show the pride to not step off the field, he was happy to do it for the team."