Aberdeen fans behaved in an appalling manner during their Scottish League Cup semi-final win over St Johnstone on the weekend.
Dons supporters threw coins, spat at and hurled cups of liquid in the direction of Celtic manager Neil Lennon at Tynecastle Stadium as their side defeated the Saints 4-0 to progress to the final.
The behaviour forced Lennon to leave the Edinburgh venue just after the hour-mark which was confirmed by a Hoops spokesperson.
"Clearly it is totally unacceptable for the Celtic manager to be treated in this way," said the Celtic representative.
"Neil has complimented the way in which the situation was handled by stewarding staff at Tynecastle.
"We have an excellent relationship with Aberdeen Football Club and we are sure they will look into this matter."
Lennon's agent, Martin Reilly, added on BBC Scotland: "I'm absolutely raging about the treatment of Neil, about the stewarding and the fans' behaviour. It's scandalous that Neil is treated like this."
