Pavel Srnicek is in a critical condition in hospital in the Czech Republic after suffering a cardiac arrest.
Srnicek has been admitted to the Ostrava-Poruba hospital, where he is said to be fighting for his life, the BBC report.
“I can confirm that it is hospitalized in our hospital, but on the wishes of the family will not disclose details of his condition,” a spokesperson for the hospital said.
During his playing days, Srnicek was a very highly regarded goalkeeper, who earned 49 caps for his country.
His first taste of English football came with Newcastle, who he represented between 1991 and 1998.
He then moved on to Banik Ostrava, but he was quickly back in the Premier League – with Sheffield Wednesday snapping him up in 2000.
Srnicek also had brief spells with Portsmouth and West Ham, before he returned to St. James’ Park as cover for the 2006/07 season.
The Magpies have been quick to give their support to the 47-year-old on social media, with their official Twitter account sending him their best wishes earlier today.