Neil Taylor: Wales defender's punishment could be increased by Fifa
Wales defender Neil Taylor could face more than a one-game ban for his red card against the Republic of Ireland.
The suspension could increase to three games if Fifa reviews the incident once it receives the referee's report.
Gareth Bale will also miss the Serbia game after being booked on Friday.
It was the Real Madrid forward's second yellow card of the qualification campaign.
Republic boss Martin O'Neill, preparing his side for a friendly against Iceland on Tuesday, said the tackles by Taylor and Bale - on John O'Shea - were "very, very poor".
And Irish Prime Minister Enda Kenny told the Irish Times the tackle by Taylor was "horrific".
O'Shea needed stitches after he was tackled by Bale in the second half of Friday's game, which left Wales four points behind the Republic and Serbia with five matches left.
Wales boss Chris Coleman defended his players, and said Bale did not even think the challenge on O'Shea merited a booking.