"Ljajic and Mitrovic did not train, but tomorrow they will be on the field. Adem has problems with his back and Mitrovic got a minor injury," Serbia's assistant coach Mladen Krstajic said as quoted by the Serbian B92 news station.

The Serbian national football team will be based in the Baltic Sea resort of Svetlogorsk, just outside Kaliningrad, where they will face Switzerland on June 22.

The FIFA World Cup will be held in Russia from June 14 till July 15, with Serbia set to face five-time champions Brazil, Switzerland and Costa Rica in Group E.