The 26-year-old passed away when his heart stopped after a training session in Coverciano, Italy.
A statement on the club’s official website read: “Tragedy struck Espanyol and the family of Dani Jarque this evening. The blanquiazul player died from a cardiac arrest.
“The doctor Cervera carried out CPR on the player and used a defibrillator, which showed that the arrest was non responsive.
“After a few minutes the first ambulance arrived from the Florence emergency services, who tried again with the defibrillator they carried.
“The medical services continued carrying out CPR, administering adrenaline and atropine for an hour, but the player’s heart did not react, so finally that determined his death.
“RCD Espanyol, broken with pain, wish to put themselves at the absolute disposition of the family of our captain Dani Jarque, to whom go our warmest thoughts.”