Celtic have blasted a 'small number' of their supporters after protests took place outside Parkhead.
The club were left raging after barriers were broken down and small clashes with the police took place following the defeat to Ross County in the Betfred Cup.
And Celtic say some of their players were left 'shaken' after incidents which saw staff leaving the stadium targeted by objects thrown by supporters.
Neil Lennon and his players had to be escorted out of Celtic Park following the protests and the club insists it is 'unacceptable' behaviour.
A statement said: "Everyone at the club is hugely disappointed by this afternoon’s result, one which has ended our phenomenal run of 35 consecutive cup victories.
"While we sincerely share the huge disappointment of all Celtic supporters, there can be no excuse for some of the violent scenes at Celtic Park this evening. The club will be investigating these events fully.
"For players and a management team, who have given so much in recent years and have delivered 11 consecutive trophies, to require an escort from Celtic Park while being targeted with missiles, is simply unacceptable.
"While we understand that only a small number of people were involved in this behaviour, some of the actions this evening, which have obviously left our own players shaken, cannot be condoned in any way."
