European football's governing body UEFA said the second game of the sanction would be suspended for two years.
They also fined Austria Vienna 20,000 euros for the trouble at the club's stadium during the 3-0 defeat on December 3 which UEFA said included a pitch invasion and the throwing of missiles and fireworks.
Austria Vienna, who can appeal the decision, finished bottom of Group L with only two points from six games.
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'Andy Robertson has a decision to make as a player, where you either roll your sleeves up and give someone great competition or you accept decisions and say that your time is done.' Alan Shearer on the conundrum facing Arne Slot's Liverpool
