Celtic assistant manager Johan Mjallby says the club had no option but to take strong action against the fans whose behaviour marred last Friday night's win over Motherwell.
The Parkhead outfit suspended 128 fans from their games and relocated 250 season-ticket holders after smoke bombs and flares were thrown as well as seats being damaged at Fir Park.
The Scottish Professional Football League described the scenes at Fir Park as "shameful" and promised an investigation once it receives its match delegate's report.
Speaking at Glasgow airport before the flight to Spain for their final Champions League clash with Barcelona on Wednesday night, Mjallby said: "It is very unfortunate what happened and I don't think it left the club with any other option but to suspend some fans.
"You don't want to have mayhem, you can't have this disruption inside sports grounds so we have to get together to support the club in the best way.
"It is a distraction I don't like to see because I like to work with the players.
"The club has reacted in the best way."