"The Fifa Disciplinary Committee has opened disciplinary proceedings against the Swiss players Granit Xhaka and Xherdan Shaqiri for their goal celebration during the match Switzerland vs. Serbia", Fifa said in a statement sent to journalists on Saturday.
A day after being put under investigation by FIFA for complaining about the refereeing of their 2-1 World Cup loss to Switzerland and misbehaviour by fans, Serbia's football association has filed an official complaint with the sport's governing body alleging "biased officiating" by referee Feliz Brych.
Shaqiri, who plays for Stoke City, was born in Kosovo, the former Serbian province that declared independence in 2008. Then Shaqiri, who was born in Kosovo and has the new nation's flag stitched onto his right boot, slotted home a dramatic winning goal near the end of the match and wheeled away flashing the same sign.
He joins team-mates Granit Xhaka and Xherdan Shaqiri, who are the subject of disciplinary proceedings after making politically-motivated gestures during their celebrations.
Xhaka's father was a political prisoner during this time, but both he and Shaqiri denied that their celebrations were intended as provocation towards Serbia fans.
Switzerland captain Lichtsteiner, a new signing for Arsenal, made the gesture after Shaqiri's 90th-minute victor.
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What is he doing?' But I " m not a rules person, so if the rules say two-strokes, then that's what he should have gotten". He entered the final day in a four-way tie at 3 over and was still only one stroke behind Koepka when they made the turn.
The Serbian FA was also fined SFr54,000 (£41,217) for the behaviour of fans during the game - the display of discriminatory banners and the throwing of objects.
In further fallout from the Group E game, FIFA said Sunday it had opened disciplinary cases against Serbia coach Mladen Krstajic and federation president Slavisa Kokeza for comments made after the game.
This is seen in Serbia as promoting the idea of a Greater Albania - a project that would see Albania's borders expanded to include parts of Serbia, Macedonia, Montenegro, and Greece.
Switzerland needs to win or draw with Costa Rica on Wednesday to be sure of qualifying. "And I think the main thing is that we were not able to finish our opportunities".
Serbian striker Aleksandar Mitrovic ripped Shaqiri, saying, "If he loves Kosovo so much and decides to flaunt the flag, why did he refuse a chance to play for their team?"