PAOK's Russian owner Ivan Savvidis, coach Igor Tudor and players were the target for jeers and abuse from the fans after their team slumped to a 1-0 home defeat by Iraklis in a tense Thessaloniki derby on Sunday.
Groups of home supporters surrounded the VIP exit and mixed zone area after the final whistle, throwing rocks and missiles at players and officials as they attempted to leave the Toumba stadium in a toxic atmosphere.
Riot police moved in to disperse the fans, some of whom were holding planks of wood and other objects, causing delays for both sets of players and officials leaving the ground.
PAOK was missing several first team players due to injuries and went down to Brazilian Leozinho's 73rd-minute goal, which came two minutes after home midfielder Dimitris Pelkas had struck the post when put clean through on goal.
Tudor's position has already come under pressure due to PAOK's inconsistent form but it remains to be seen whether the former Croatia defender will be forced out.
"A defeat is a defeat whichever way you look at it and we are all upset about the result," Tudor told reporters.
"We had lots of important players missing today and we had to change our system. We had a good first half with a few decent chances but unfortunately we didn't get the goal we deserved and that cost us dear in the end."