The SPFL are appealing for supporters to contact police after the dangerous incidents at Ibrox that saw bottles thrown onto the pitch during Rangers ' defeat to Celtic.
The start of the second half was delayed by three minutes after keeper Joe Hart informed referee Willie Collum and his manager Ange Postecoglou that shards of broken glass had been hurled from the Rangers end.
A member of Celtic staff also required stitches for a "head wound" inflicted in a separate incident.