"The fans will be different, volunteers might probably need help to unwind and to ensure they do not have any feelings of rejection," Gvozdeva said.

She added that the physiologists would work at the three main volunteer centers. One will be located at the FIFA Fan Fest and two in and around the stadium.

The 2018 FIFA World Cup will be held between June 14 and July 15 at 12 stadiums across 11 Russian cities. Rostov-on-Don will host four group stage matches and one round of 16 fixture.