CELTIC have claimed their supporters were subjected to "a high degree of provocation" after announcing they have opened an investigation into the clashes between fans and police before their Champions League match against Ajax in Amsterdam on Wednesday night.
Police in the Netherlands have arrested 44 people, including 28 Scots, after fans armed with bottles and sticks attacked plain-clothed officers in an incident described as "coming out of nowhere".
Celtic have, however, responded to claims from their fans that they were poorly treated by opening the internal investigation to "fully understand events".
A statement from the club last night also claimed that there was "no question that Celtic supporters have been subjected to a high degree of provocation".
Eight police officers were injured in the violence in the city centre before Celtic's 1-0 defeat.
"Celtic football club is currently investigating events in Amsterdam last night (Wednesday)," the Celtic statement read. "We have been informed that there are five individuals detained in Holland.
"We are not clear if they have any formal association with the club, however, we will be liaising with the local authorities in Amsterdam, our own police and the British Consulate in order to fully understand events.
"We would stress that there is no excuse for any form of violent conduct.
"In addition, we have received numerous complaints from Celtic supporters in relation to their treatment in Amsterdam, which we will also investigate fully.
"There is no question that Celtic supporters have been subjected to a high degree of provocation."
One officer was knocked unconscious in the fighting in Dam Square and police said the majority of those arrested were Celtic fans. The incident came after clashes during Ajax's trip to Glasgow a fortnight ago.