The 31 year old has not played since 2012, but has been given the chance to resurrect his career with a two year deal
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Celtic assistant boss Johan Mjallby insists the club had no option but to take action against the fans whose behaviour marred last Friday's win over Motherwell.
The Parkhead outfit suspended 128 fans from their games and relocated 250 season-ticket holders following damage caused to Fir Park seating.
– Johan Mjallby.
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.
Celtic midfielder Beram Kayal out for at least six weeks after breaking bone in foot