Bullets sent to Celtic player Paddy McCourt have been discovered in a package by mail staff.
It comes days after packets containing bullets were sent from Northern Ireland to Celtic manager Neil Lennon and player Niall McGinn.
The package addressed to 27-year-old McCourt was discovered by staff at a Royal Mail sorting office in the east end of Glasgow.
Police were immediately alerted and launched an investigation.
A Strathclyde Police spokeswoman said: "We can confirm that we are currently investigation a suspicious package discovered at a Royal Mail sorting office in Cubie Street in Glasgow on Tuesday 11 January.
"Inquiries are ongoing."
McCourt is from Northern Ireland and has played for his country.
It is believed the packet was addressed to him at Celtic Park.
Last week packages addressed to Lennon and McGinn were intercepted by staff at the Royal Mail sorting office in Mallusk, County Antrim.
The mail was bound for Celtic football club in Glasgow.
Police in Northern Ireland said officers were called to the Mallusk sorting office on January 5 after postal workers reported suspicions about two items of mail.
The items were removed for further examination, and police are investigating the incident.
Celtic winger McGinn is also a Northern Ireland international player.
Lennon, a former Northern Ireland international, has received death threats in the past.