Sevilla coach Joaquin Caparros said after his side's 2-0 win at Real Valladolid on Sunday that he had been diagnosed with leukaemia, but vowed to continue in his job.
"Everyone knows I have Sevilla in my blood but there has been a problem with my white and red blood cells and I have been told that I have chronic leukaemia," Caparros, 63, told a news conference.
"It does not impede me from doing my job and I'm carrying out a normal life day to day. I am not receiving any treatment so everyone should remain calm.
"I want to keep enjoying my job, and I thank the club for allowing me to continue with this opportunity. I'm not going to talk any more about this."
Caparros took charge of Sevilla for the third time last month when he switched from sporting director to head coach after Pablo Machin was sacked.
His side climbed to fifth in La Liga after the win at Valladolid, which lifted their hopes of qualifying for the Champions League by taking them to within one point of fourth-placed Getafe.