When Griffiths walked toward Spanish refereee Alejandro Hernandez to show him what had been thrown, the player was shown a yellow card (apparently for time-wasting).
The banner showing a masked soldier identified with Irish Republican imagery was shown by fans on Wednesday during Celtic's 4-0 win in Glasgow in a Champions League second qualifying round, second-leg game.
After the final whistle, Scotland worldwide Griffiths tied a Celtic scarf to one of the goalposts.
Meanwhile, Brendan Rodgers's side are facing more sanctions after Wednesday's second leg encounter at Celtic Park.
Kundai Benyu, who joined the club from Ipswich, also made his competitive debut as a second-half substitute and Rodgers was pleased with both players' contributions.
Palestinians Riot Outside Temple Mount for Second Night, Dozens Reported Injured
Jews revere the site, where the two Jewish temples stood in biblical times, as the Temple Mount. The authority was not included in the Israeli decision to impose the security changes.
France's armed forces chief resigns
When Gen de Villiers criticised the cut last week, it was at a meeting with deputies that was supposed to be off the record. The leader of the hard-left France Unbowed, Jean-Luc Melenchon, called it an " enormous mistake " on Macron's part.
'Apes' flicks 'Spider-Man' aside to win box office war
Sony's " Baby Driver " landed in the fourth place with an estimated 8.75 million US dollars in its third weekend in North America. Fox's War for the Planet of the Apes box office collection fought to $5 million at 3,251 North American areas on Thursday night.
Linfield were hit with a fine of 10,000 euros after home fans threw objects onto the pitch during the first leg in Belfast before a group of supporters attempted to invade the pitch at the final whistle.
The cases will be dealt with by the Uefa Control, Ethics and Disciplinary Body on Thursday.
The former Genoa loanee has moved to Parkhead on a permanent basis from Manchester City and hopes are high among the Hoops supporters that the 21-year-old can become a cult hero among the Celtic Park faithful.
"Although the majority of supporters attending these matches are well-behaved and enjoy the game, there is often a minority who are intent in drinking too much alcohol and engage in criminal behaviour such as disorder, offensive behaviour and vandalism". They were also ordered to close a section of their ground for the club's next match in European competition.
The Hoops fans have been quick to take to Twitter to give their verdict on the new man, which was overwhelmingly positive.