Caparros, 63, broke the news in his post-match press conference following Sevilla’s 2-0 win at Real Valladolid on Sunday.
However, he will remain in charge of the club despite his condition.
In quotes reported by his club’s official Twitter feed, Caparros said: “It doesn’t impede my work.
“I am going about my daily life – on a day to day level, for training. I want to enjoy my work and I want to thank the players and the chairman.
“I am not receiving any treatment – everyone can be assured that I am not receiving any treatment.