According to UEFA's official statement, European and Spanish football are in mourning following the death of Tenerife forward Jesús de Miguel at the age of 30.
The forward had played for several clubs in the lower divisions of Spanish football and helped Tenerife earn promotion to LaLiga 2 last season.
UEFA President Aleksander Ceferin said: "We are heartbroken by the passing of Jesús de Miguel Alameda. We search for words, yet find only silence. In this silence, our hearts and thoughts are with his family, his teammates, everyone at Tenerife, and all who are grieving this tragic loss.
"There are no words of comfort, and nothing can ease this overwhelming sorrow. We stand with his devastated family, his loved ones, and the entire Tenerife football community, who mourn this cruel loss today."
"Jesús de Miguel's family wishes to thank everyone for their messages of support and sincerely asks that their privacy be respected at this terrible time."
The Royal Spanish Football Federation added: "Spanish football mourns the passing of Jesús de Miguel. Deeply shocked by this sad news, the Spanish Football Federation wishes to express its deepest sorrow at his death today. We extend our most sincere condolences to his family, friends, and loved ones, as well as to Tenerife and all its fans. Our thoughts are with them at this time of profound grief."
A minute's silence will be held at all UEFA matches this week in memory of Jesús de Miguel.