Millwall and Montenegro goalkeeper Matija Sarkic died on Saturday at the age of 26, the Championship club confirmed on Saturday.
Sarkic fell ill in his home country while on international duty. Montenegrin daily newspaper Vijesti reported Sarkic died in an apartment in Budva early in the morning.
"Everyone at the club sends their love and condolences to Matija's family and friends at this immensely sad time," Millwall said in a statement.
"The club will make no further comment at this time and asks that the privacy of Matija's family is respected."
"Our dear Matija, we will miss you and your cheerful spirit, your work ethic and your great defending," the Montenegro Football Association (FSCG) said in a statement, describing Sarkic as an "always smiling guy.