Kepa was all set to leave Athletic Bilbao for Real in January 2018, only for Zinedine Zidane to block the switch.
He recalled: "It was a few months in which my grandmother saw me more in the newspaper than in person. There was a lot of talk about me. Also because of an injury I was not going through good times.
"I was finishing my contract and since January I could talk to teams. I didn't get to see what happened.
"I ended up renewing and with the idea of staying and after six months I left. It's the only contradiction."