The former Springbok was fined 21,873 pounds, of which 13,207 pounds was suspended, by a European Rugby Cup (ERC) disciplinary hearing in Dublin on Thursday.
After the Leinster pool game, which English Premiership side Saracens lost 25-23 at Wembley on October 16, Venter warned the International Rugby Board the game would be harmed if they did not address problems at the breakdown.
Venter was furious that French referee Christophe Berdos failed to sin-bin three players from Irish province Leinster during the second half, when a rash of penalties prevented his team gaining momentum.
"There is a real danger that if we don't take action going into a World Cup year, the game of rugby is going to die, be killed stone dead because the public won't come to watch," Venter said at the time.
"We will end up playing one type of rugby in the league, another in Europe and when you get to the World Cup, wait and see which referee you get."
But an ERC ruling issued Thursday said: "The independent disciplinary committee found that Mr Venter was guilty of misconduct in that he had been inappropriately critical of ERC, the tournament, the match officials and the sport of rugby union, and imposed a fine of 21,873 pounds.
"However, the committee decided that 15,000 euros of the 25,000 euros fine would be suspended until 30 June 2012, and would be payable only if Mr Venter is found guilty of further acts of misconduct arising from ERC tournaments before that date."
This is not the first time Venter has faced disciplinary action recently.
He missed Saracens' Premiership final loss to Leicester at Twickenham in May after being hit with a touchline ban by English officials following a fracas at the eventual champions' Welford Road ground a couple of weeks earlier.
And in January, he received a suspended coaching ban and had to apologise to referee David Rose after criticising his handling of a separate Premiership encounter between Leicester and Saracens.
Source: AFP European Edition
