In a statement on the club website, Celtic coach Neil Lennon said he was "disappointed but not surprised" at the violence after Ajax fans had ripped up seats and thrown them at Celtic fans two weeks ago when the teams met in Glasgow.
"If there are Celtic fans who have been out of order and they are season ticket holders, then the club will take appropriate action, obviously," Lennon said.
But he added that the Celtic fans may have fallen foul of a "culture" of provocation at Ajax.
"I'm not going to point the finger at them as don*t know what the facts are. But our fans are exemplary. I have been here 13 years and everywhere they go, they have been an absolute credit to the club," he said. "Again, I don*t know the facts in front of me, but if there was a reaction, there was immense provocation in the first place."