Engineers carrying out excavation work in the Provan area of the city made the discovery at around 8am and raised the alarm.
The suspected bomb alert sparked traffic chaos, with Blochairn Road, near to the old Provan Gas Works, cordoned off by police.
Specially trained officers and explosive ordnance disposal experts from the army's Explosive Ordnance Device unit were alerted and made their way to the scene.
Infrastructure specialist firm Barhale is currently carrying out work in the area.
A spokeswoman for the company said: "Workers discovered the metal object during excavation work."
Police said the alarm was raised by workers early yesterday.
A spokeswoman for Police Scotland said: "We received a call shortly after 8am.
"Workmen on a site in Blochairn Road discovered an unidentified metal object.
"Police attended and, as a precaution, Blochairn Road was cordoned off."
The street was reopened at 11am yesterday after the EOD was satisfied there was no explosive device in the road.
Earlier this year, the Evening Times told how a Glasgow couple found an unexploded artillery shell, while clearing out a garden shed.
Alistair and Gillian Paterson unearthed the Second World War device as they prepared to move into their new home in Scotstoun.
It was only after army bomb disposal experts were called to the house in Victoria Park Drive North they fully realised the risk posed by the device they discovered in the shed.
The shell was removed from the property and officers from the Explosive Ordnance Disposal team carried out a controlled explosion.