Scott Diver, 16, has been away from his home in Clydebank since Saturday September 17.
Man Arrested Over Celtic Park Effigies
Police have arrested a man in connection with alleged offensive behaviour after effigies were hung from the stands during the last Old Firm game.
Officers said on Wednesday that a 27-year-old man has been arrested in connection with alleged offensive behaviour at the match on September 10.
It is understood the arrest relates to blow-up dolls being strung up at Celtic Park.
The latest arrest comes after one man, aged 22, was arrested at the stadium on the day over an alleged alcohol-related offence.
Police Scotland said they are now investigating allegations of "a number of incidents involving vandalism and offensive behaviour within the stadium''.
Officers are appealing for fans to send in pictures and video of vandalism to the toilets in the away end, having previously said Celtic planned to deal with the matter internally.
Detective Inspector David Stewart said: "We are continuing to investigate incidents of vandalism, disorder and any other associated criminality which occurred during the game.
"Today, specifically, we are requesting people with mobile phone footage of vandalism within the toilets of the away support section to contact us.
"I would ask anyone who witnessed or who captured this vandalism to contact police as it may assist with our enquiry.
"I understand there were a number of images and video shared online of this and I would be keen for people to contact us directly with any information they may have.
"As part of the wider investigation, we have been viewing CCTV and obtaining footage from broadcasters in order to identify those responsible for disorder, vandalism and offensive or antisocial behaviour.
"We have a dedicated email address set up where people can contact police on the enquiry team, and that email address is CelticRangersDisorder@scotland.pnn.police.uk or contact the team at Shettleston Road police office on 0141 532 4846 or Police Scotland on 101.''
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