The attacker was pictured squirting his water bottle towards sections of the home support after his team netted a late winner at Parkhead last month.
It was a topsy-turvy affair in which Rangers took a 2-0 lead before the break. Celtic rallied, yet despite bringing things back level, Hamza Igmane struck late on to win it for the visitors.
Cerny was the subject of a police probe for the ‘Watergate’ incident, although no criminality was found.
The SFA has since followed up by issuing a formal warning to Cerny over his conduct and the need for improved behaviour going forward. No action has been taken against Nedim Bajrami at this stage, who was also seen to be spraying water at the home fans.
Celtic manager Brendan Rodgers reacted to the incident late last month: “I think it’s a lack of respect if a player runs up a touchline and he’s squirting a water bottle in the supporter’s face,” he said.
“I certainly wouldn’t want my players to do it.
“Listen, it works both ways.
“There’s a lot that comes to players as well from the stands to coaches, managers and players. But I think we all know there’s a line that we shouldn’t cross.
“It is a very emotive game, an amazing fixture, and I thought it was great to have the fans back in. I think that gave it that extra bit as well.
“But I just think there is lines we can’t antagonise, because in this fixture in particular, that can lead to an issue. I understand the jubilation and Rangers players had every right to celebrate with their supporters.
“You come to Celtic Park – like it would be when you go to Ibrox – and when you win a game of that magnitude you celebrate. But not in that way.
