Cops are looking bottle throwers after glass smashed onto the pitch throughout Sunday's Outdated Agency match at Ibrox.
It is understood that in half-time of the Rangers v Celtic sport, between 12.45pm and 1pm, a glass bottle was launched from the Copland Street Stand onto the pitch.
Damaged glass from the bottle was discovered scattered in entrance of the goalposts.
The second half of the showpiece conflict was delayed by three minutes after Joe Hart alerted Willie Collum and stewards for it to be cleared.
Police have stated the incident may have left somebody severely injured and are calling on anybody with info to return ahead.
Inspector Brian Fraser, of Higher Glasgow’s Divisional Violence Discount Unit, stated: “Fortunately no-one was damage on account of this incident, nevertheless, it may have brought on severe damage.
“I'm interesting to anybody who witnessed the bottle being thrown or who has any details about the incident to please get in contact.
“Anybody with any info which may help our investigation ought to name police through 101, quoting incident 0892 of three April.”
In a separate incident, a member of the Celtic employees was hit with one other bottle and required stitches for a head damage.
A Celtic spokesperson stated on Sunday: "We are able to affirm that a member of our backroom employees was struck by a glass bottle.
"He required pressing medical therapy and stitches to a head wound. The matter is now within the arms of Police Scotland."
A Rangers spokesperson beforehand informed Sky Sports activities Information: "We're aiding Police Scotland relating to each incidents and may affirm that stadium CCTV is being reviewed.
"We strongly condemn each incidents and the perpetrators might be banned."
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