Nemanja Matic has threatened to quit the Serbia national team after criticising his teammates following their 4-1 thrashing by the Czech Republic on Friday.
The defeat in Ostrava handed Serbia their second consecutive loss and came after the nation failed to qualify for the 2016 European Championships following their fourth-placed finish in their group.
And Matic admitted after the friendly game against the Czech Republic he had warned Serbia coach Radovan Curcic he could retire from international football because of concerns about his compatriots' attitude both on and off the pitch.