No provocation'
Serbia v Switzerland (19:00 GMT)
When the sides met in the 2018 World Cup, Granit Xhaka and Xherdan Shaqiri scored and appeared to make an eagle gesture with their hands as they celebrated, a symbol of the two-headed eagle on the Albanian flag.
After the break-up of the former Yugoslavia in the 1990s, Serbia responded to separatist pressure from Kosovo by launching a brutal crackdown on the territory's Albanian population, which ended with Nato military intervention in 1999 - while the country became independent from Serbia in 2008.
Xhaka's father spent three and a half years as a political prisoner in Yugoslavia, while Shaqiri was born in Yugoslavia before emigrating to Switzerland as a child.
Earlier in this year's tournament, Serbia hung a flag in their dressing room that showed the outline of Kosovo filled in with the Serbian flag and the words 'no surrender'.
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Serbian journalist Nedeljko Iljukic, speaking on
BBC World Service's World Football in Qatar said: "A few days ago everyone wanted to know about the flag in the Serbia locker room, the tensions between the two teams and the fans but I can honestly say, it will be an ordinary football game.
"There is no provocation. People in the UK or wherever - I'm from Serbia - don't know exactly what has happened in our region. I don't know what the problem is with the flag in the Serbian locker room. The main problem, the only problem, is the social networks."
Swiss journalist Andreas Boni, also speaking on
World Football in Qatar said: "Xhaka's father was three and a half years in prison – and this is deep in Xhaka. The whole family story is deep in him, and when he scored the goal, all the emotions came out.
"I don't think [he will do it again] because he will learn from history I hope. He is very quiet at the moment - well balanced - but on the pitch it will be a fight. But that's what football should be - on the pitch a fight, but not [about] politics."
BBC